Actually once Sylar turned out to be the third Petrelli Brother i stopped watching the show. That was too much like a George Lucas-ism thing to do, totally jumped the shark.
Having The Cheerleader go bad, and Sylar is really her uncle and all that bullshit was stupid.
Hiro's still a good guy right? This season and Season 2 sucked. Good lord i'll just watch my dvd's of season 1 again. Why Tim Kring needed to drag this show out and become a soup opera in season 2 and 3 when he could have told the storyline in 2 full seasons is beyond me. I guess money is the only reason.
The best new writer/director of sci fi tv sold out in the same way JJ Abrams and Joss Whedon have done previously. Nowadays that might as well be called pulling a Lucas or a Spielberg.