Not really the same. In SC your skill improves and you become better at it and that has a big impact on your victories. There is also the custom character creator which is great fun I spent over 80 hours in that in SC5 and people loved my customs the nodded ones were even better.
In team games like LOL it doesn't matter how good you are, if your team is **** you will still lose. I don't see the point in that. It's the same with team shooters, I'm not really into that sort of thing.
I see what you mean now. Although many people that play LoL will team up with friends and grow together in skill which can be just as rewarding. If you don't have a dedicated group of friends then I can understand the frustration.