Its got great potential, its wasted it all. WHen the head writer apologises for a series, you know it got bad. Most of the characters aren't remotely likeable, half of them, if not more, switch sides every 3 episodes, then they switch sides when the writers change their minds about who the bad guys are.
THe problem with shows like this, and lost is the writers start off with one series writen well over a long time to pitch to studio's so they have a good story. Good writers work for years on a great idea, the second series once picked up has to be writen in 1/100th of the time of a first series, and to do so they hire 15 more writers, so you get a lot of creative differences and no clear idea whats going on.
The idea of time travel fails completely when its used so randomly, you can't run a good several series long show when at the end of series 6 Hiro goes back, changes something and everyones character is all of a sudden completely different, it doesn't work. LImited use, fine, but its overused completely. The amount of times they decide they will for instance, kill Sylar, have a clear chance, decide to, for the 6th time, use him to get what they want thinking they can control him rather than kill him when they have the chance, is ridiculous. Claire is the most pathetically bad actress in the world aswell.
It could have been x-men, with real people and good effects, but it turned into a farce.
oh, and kids, never, ever, ever have kids in shows like this, ever, ever, ever.