So, how does Heroes keep Sylar on the show and yet not have him show up all the time (since Zachary Quinto is probably trying to expand his acting career)? Why kill off Nathan--the guy who probably should have died in the first season anyway--and then through a combination of Matt's telepathy and Sylar's own shapeshifting and memory gaining from objects, make him into Nathan (or is it Sythan? Nylar?).
Anyways, it's a nice twist and makes for some pretty interesting possibilities to come out of it. There were, however, two glaring flaws. First, why couldn't Angela and HRG have Peter temporally impersonate Nathan and have him convince the President to shut down Building 26 until they could decide what to do about Nathan? After all, he's absorbed all of Sylar's powers now. Or better yet, why not have Claire donate some of her blood? Has the show forgotten that
Claire's blood is capable of bringing the dead back to life--
including HRG after he got shot in the face! Oh, right, Season 2 sucked, so the better to forget that "Generations" ever happened, the better.
Also, what's the deal with Hiro? We get this big deal about how Hiro's body is rejecting his powers, to the point where it looks like he had an annuerism, and then at the end, he appears fine. So I guess this is how they're going to further limit Hiro's time stopping abilities, then. If he uses them too much or for too long, he could die!

Then again, maybe some fans would like that?
Still, there were some great moments, such as the very creepy scene where Sylar mentally manipulates Claire like that puppet master guy, which probably made those writers of Sylar and Claire romance fanfic very happy, the sickos. And I got a kick out of Nathan revealing his powers and he and Peter bonding in brotherly love at last as they proceeded to take down Sylar together. To bad they had to ruin the moment by, once again, not showing the actual fight between Peter, Nathan, and Sylar, literally closing the doors on us and providing a light show through the cracks.

Of course, Nathan's death scene was very intense, as was Angela's reaction when she found his body.
As for the cliffhanger for Volume 5, it was kind of meh. Wasn't that impressed that Tracy is alive, or apparently it's ANOTHER Niki clone, and apparently has become like a female Hydro-Man (and you got to love the fact that this provides the show opportunties and fan-service to show shots of Ali Carter fully naked and get away with it since it's not "real."

). Not to mention they hammered the point that Sylar hasn't been completely contained.
Still, not a bad way to end the season. I'd have to say that it's pretty obvious that once Jeph Loeb was taken off and Byran Fuller came back, the series improved tremendously. If only this had happened much, much sooner.