SOME of the acting on the first two was subpar, not to mention Jar Jar Binks was involved. However, the way I feel is that what it lacked in acting it made up for in script-writing and top of the line CGI. SPOILER! Anyone who didn't feel choked up at the Qui-Gon funeral scene has no feelings.
I guess I have no feelings then, because I already knew what a moron Qui-Gon was. Making a Jedi Master responsible for unleashing the greatest evil ever, starting the downfall of the Jedi, and being the reason millions of lives would be lost? No, it didn't work for me. Now if it had been the first movie ever, I might have. But meh, most people didn't even know what Star Wars was until the prequel was out, so they hadn't watched the previous three. And no, script writing falls apart with bad acting, just like good acting falls apart with bad script writing. One cannot fully support the other.
And by the way, I like those "flashy lights" and "coolio jumps". That's part of what made it such an epic fight scene at the end of III. The choreography was flawless. I'm not going to make any friends for this comment, but I laughed at the "lightsaber fight" between Obi-Wan and Darth Vader in episode IV. I watched the un-remastered version, because we have the old 1970's video tapes (I think; might be 80's), and along with being one of the slowest, most uninteresting fights in Star Wars history, the lightsabers turned into the acting sticks a few times because of subpar technology.
Which is why I hate what Star Wars has become. It's just now milked for every Jedi fight scene it can get, and is now only recognized by these special effects. Hence the shallow cartoon we now have , and the fanbase that is made up of little five year olds. The original trilogy never needed Jedi fight scenes, so that's why the generation now doesn't like them: Because they only identify Star Wars with special effects, take it away, and they don't like it. Which is my point. The prequels created this mindset.
I hate it when something becomes something it isn't just to please other people.