I agree about Sylar not being written well, power-wise or story-wise. I find him just as over-powered as Hiro and Peter used to be, and as Matt is becoming. However, even at his level of competence, his powers are never used to their fullest. The writers give him many powers, and then he seems to forget he has them. I mean, for example, why has he never explicitly used that power he got from Bridget. Clairsentience. Why did they even give him the power only to have him ignore it, pretty much? He's looking for answers, and he never thinks to touch an object and see what happened around that thing? I mean, the writers obviously make Sylar fairly competent because they (and the rabid fangirls) want to make sweet love to him, so why not have him use his whole arsenal? Because then it would simplify the plot too much. If he could get an answer that quickly, there would be no story. It becomes that way with a lot of multi-powered characters. You either make them ******ed, allow them to ruin the story, or come up with some convoluted way to keep them out of all of it.
In the first season, Peter couldn't control his power. Then in the second season, he was an amnesiac and a blind follower. Third volume, he was completely depowered. Now he's limited to one power at a time through touch. Provided they keep this permanent, I will be thrilled beyond belief. The other solutions seemed temporary, like putting band-aids on a gaping wound. Is it convoluted to change Peter's power like this? Maybe, but I don't care because Peter's power has always bothered me. I'm willing to let it slide.
Frankly, I'd love it if Hiro stayed depowered or only got teleportation, if Sylar got limited or killed, and if Matt was limited too. Characters with that much power make these writers lazy, in my opinion. They just sit back and pull things out of their asses because they think they can get away with it. I've always preferred the less powerful characters, like Nathan, Isaac, Niki, Angela, etc. The ones who couldn't just go out and take over the world with their powers.