Wow, personal top five games of all time that's a tough question. I guess because of the personal I won't answer it using artistic, more objective standards of excellence and instead dwell more on the games with more personal impact on my life.
1. Kingdom Hearts: While the second game was a let down and everything since I haven't bothered to play because I really cannot take more terrible iterations of something beloved, the first game really cannot be overrated for how important it was in my life. Having always been a huge disney fan as a girl and loving the final fantasy series because my father played them all and did distinct voices for each character (I wasn't quite old enough to read/read quickly), this was legitimately a match made in heaven. However, the reason this game tops this list is because at the time it was given to me, I'd just gotten out of spending five months in a hospital from a really horrific spinal operation. We got home Christmas day after my mother literally told them that she was taking me out of the hospital because I was no longer doing well there (mentally I think, it was a pretty dark time) and that spending Christmas in the hospital would just make everything worse. We got home to my father and brother and because my mother had always been in charge of planning Christmas nothing was done so we all were kinda down until my father said he'd gone shopping and gotten little gifts until we could do a proper Christmas. He gave me Kingdom Hearts and due to the fact I was on morphine and not sleeping very much at night or during the day, I played this game for most of the two year healing process (most of which I couldn't really move for). It's an excellent game and would probably make an impersonal list, but it's always number 1 in my heart. Anytime I'm in a bad spot, I play this game and immediately feel a lot better.
2. Zelda Ocarina of Time: It was pretty funny to me to see this keep getting rated as overrated on the other thread because I don't think things like this could be overrated on a technical or emotional scale. This was a game I was stuck on for literally fifteen years of my life. I'd play it and play it and just be stuck on the adult water temple until finally I just quit in frustration for a year. This kept happening until finally my father had to sell out N64 due to money issues. This game was the one that got away until the Wii came out and had the ability to play it. I came back at 18 and finally defeated it. This is the only game I've thrown a controller down in happiness over and danced around while taunting it over. I actually remember telling my boyfriend at the time that I knew that was the day I became a woman.
3. Guardian Heroes: This game is and was crack for my older brother and I. We'd just moved into a new house with our family and my little brother was less than a month old. Both my parents had begun new jobs and we were homeschooled so nobody really had time for any of us including my little brother. That didn't really change for an entire year so we spent most of the better part of a year living and breathing this game on a nasty old victorian sofa the color of vomit. My little brother would sit sandwiched between us in his boppy pillow and we would feed him and chat to him while playing this game sometimes with one hand. I'm not 100% certain, but we probably saw every possible storyline on this game. I've also fought over this game with my brother more than possibly any other game. Cries of "you're cheating" or "you're being a cheesemachine" were frequent. Even now, we have a lot of pictures of the three of us on that couch taking care of our little brother and playing this game. I really want to get an emulator that can allow me to play this with my little brother.
4. Dark Alliance: This game for me is one of those games that has legitimately damaged the relationship I have with my older brother forever. (Not in a we cannot get on sort of way, but in a "I will never ever forgive him for this as long as I live sort of way". We played this game together a lot and fought over it all the time. He is a treasure hog and would frequently be walking around in the best gear while I was dying in gear from two levels back and he'd blame my skill level even though he was running around collecting loot while I killed everything. Eventually, we had a huge blow up fight and refused to play the game together at the request of our father that we either never fight again or stop playing. A few years passed and I ended up back on the couch from a huge leg operation. I decided to play the game on my own just to get the achievement of finishing it. I played it for months until I finally reached the last level (the one we'd never been able to get to from all the fighting). I stupidly decided to invite him to play it with me so we could put our fight to bed for good and finish the game together. So we got to the final boss and I died when we were a few minutes from killing her. I told him to stop so we could try again and finish with me alive and he gleefully refused and beat her while I tried to stand up and turn the system off. He pretty much laughed and taunted while I yelled and cried about him ruining everything I'd been working on for months. He claimed I was just out of control because of the meds I was on. When it finally got through the appeals court that is my parental authority, they grounded him from electronics from a month and gave him a real going over for having done something so malicious and cruel. Still, I've never gone back to beat the final boss and I'll never forgive my brother for this one.
5. League of Legends: Although it pains me to put this game on this list, it would be dishonest if it weren't here. I played this game when it was in beta and five years after that. I quit after some life problems happened and I realized it was partially responsible for my aggression and poor decision making. Still, there are many people who were once important to me I met on this game and I honestly don't think I could have gotten through the ages of 14-20 without it. This game was my version of WoW in most ways. I didn't sleep or eat enough because I was playing it. On the other hand, I did get a good grade in chemistry and math because my clan leader ordered two of our members that were grads in those fields to tutor me and banned me from playing with them during school hours.
Honorable mentions go to: Jak 2, Sly 2, Bioshock, The Last of Us, PS2 Gauntlet, and Dungeon Crawl: Stone Soup
.