As an actor, Aamir is actually pretty decent. He usually gives solid performances. And yeah of course there are some people who are better then him. But then again, not every actor can deliver flaw free performances all the time. I actually feel bad for Aamir in this respect because he isn't as charismatic as the other Khans. (say what you want about SRK and Salman's acting skills but their charisma and people skills are amazing) But then again, Aamir is extremely selective of his filmography so he doesn't get as much exposure as the other Khans.
But it has to be said that his script picking sense is just amazing. He chooses the most diverse, interesting, semi-realistic movies while still managing to remain within mainstream Bollywood. Like Taalash, TZP, 3I, Lagaan, Ghajini, and RDB are amazing films with amazing acting! I'm always (especially recently) with the movies Aamir chooses to do. It's rarely a let down.
30