It was the best ending ever! Come on? no one cried? Seriously? Why was it so bad?
SPOILER:
Nathan was tiered up to be the villian all along, but him saving the City was what took it to avoid the future. Saving the Cheerleader kept Sylar from getting her power, but it also allowed for her to plant that nugget of insight into Nathan's brain. It was as simple as him flying Peter out of there. If Claire would have shot what guarentee was there that the bullet wouldn't go straight through? Peter would have blown up like Ted did when Thompson shot him. Granted everyone showing up and doing their part to slow down Slyar was a bit lame, and Niki discovered her power way to late. But Nathan sacrificing himself to save the world was touching. The only way to ruin it would have Nathan come back totally ruining the 'self-sacrifice' emotion response of the audience. Peter might come back, but that would ruin the second season because it would reintroduce the 'exploding man' dilemma. Sylar never wanted to blow up and he seems to beable to control it, less emotional it seems. So he'll defintely be back, perhaps as in another role. Teaming up against a stronger villian maybe