I agree with the comment about Micah. And I kindof agree with the comment about Mohinder, except that he's always been the weakest character for me, and I can never get a good idea of what he's doing or why. It's very weird that he didn't at least listen to Bennet.
Micah's dad (whose name I can't remember...DL?) is a consistent character, but one I've never liked. I know a lot of people think he's really neat, and were disappointed when he fell apart on Monday, but that's how I've always seen him--a deadbeat Dad who can't hold a job, runs away from problems, and resorts to crime at the first opportunity. If he decides to turn around and try to get Micah's act together, I'll be pleased...but I'd be more pleased if he tries to shepherd Micah into a life of crime, because that would be far more daring and interesting.
Niki, on the other hand, I like more every week, and Claire is proving to be one of the most proactive characters on the show (Hiro is the other, but he's had two very slow episodes in a row). I've always liked Nathan, because he's such a conflicted slimeball, and I'm delighted to see so much growth in him over the past two episodes. I can really see him turning into the leader of a team, assuming such a thing ever happens.
Overall I think the show is still on track, but with some stumbles here and there.