I liked this episode a lot, but not as much as previous ones. - I guess nothing can beat that cello scene, lol - I missed a few minutes in the end... but love the twist where Nathan gets killed, and his mother doesn't suspect a thing. (Package delivered, hehe )
I found Hiro saving the offcer worker boring. BUT I enjoyed Hiro's interaction with his sister. That was really cute!
I felt, in this episode, that Peter was
pretending to be the usual careing son & brother, rather than actually being one. I mean, he also excused himself dimplomatically for not returning Nathan's calls. Bull, because in the past he would have always found time to call family.
Maybe:
a) Peter is actually aware about what happened to Nathan, just not speaking about it.

Peter is pretending to not be too interested in the whole "I'm special" issue when he is with Nathan, since he knows what his brother is capable of doing (locking people up in a facility, etc).
Other observations/comments:
- Samuel is a great character! I'm enjoying him more & more. Funny thing, I doubt that "family" he always speaks of is very loyal to him. They seem to be rather scared or just using him... once they find a way out, they'll most likely take it.
- When Claire suggested to find a job of some sort to her father, it felt nice! Finally, some real life issues besides being "Heroes" 24/7.
- It was also cool to have Nathan resurect to life as Sylar after being shot. Cool plot twist!
- Tracy was alright. I'm missing Micah though! Where is rebel??
- Emily Rose was excellent as always!