Heroes was cool because it was basically a bunch of normal people discovering they had super powers and then using them for the greater good, except for the one guy who was the villain, and who's power drove him insane for the most part.
After the 1st season they all basically became douchebags with super powers, it became X-men lite, and the storytelling was absolutely terrible.
Matt Parkman is the lamest person ever. "Uhhhh, I have the power to control people, qq, I hate my life."
Nathan was a backstabbing traitor with no sense of loyalty.
I don't know why the fuck Peter became so emo, maybe he was inspired by Emo Parker in Spider-man 3
Their mother was a cryptic bitch for no good reason
HRG, I just don't fucking understand. Protecting your daughter was one thing, but the repeated need for secrets just stopped making sense in season 2.
Claire made no sense, I mean, I'm not an immortal, but I don't accidentally kill myself every other day which causes people to find out I'm immortal. This girl would end up in so many situations where she should be dead for no real reason. She has the easiest power to keep secret but she somehow manages to expose it regularly by doing suicidal bullshit.
Hiro's character was overplayed. Yes, season 1, comic book nerd gets super powers, and acts like super hero, I get it. 3 Seasons of comic book quotes and nerdom and not dying due to rampant stupidity however is another thing all together.