I can finally talk about this show here! I purposely avoided the topic like grim death, in order to save myself from being spoiled, but they just aired the finale last night!
I liked the finale a lot. May have dragged in some places, but at least everything was all tied together whilst leaving further storylines open. Peter couldn't fly himself cause we've only ever seen him use one power, never a combination of say invisibility and flight. Although I remember in the Five Years Later episode he was invisible and used telekenisis to make a glass come to him, but you can always say he's had five years training. Foreign language is always a problem when it comes to Western shows. In Lost for example, Jin and Sun speak Korean either on the island, or mostly all the time in flashbacks, yet the actor who plays Jin, is known to have been mocked by Korean fans for his poor pronounciation. I don't speak a word of Korean, so I wouldn't know. But also with a flashback of Sayid in Iraq, everyone was speaking perfect English!
As a whole, Heroes is a great show, I enjoyed it more than I thought I would, with some episodes being right up there as TV genius (the character focused episode of Mr.Bennet for example). Sylar's still alive (yay) and the promise of an even worse 'boogey-man' is always intriguing. As for Hiro in the 1600's, do you think this could mean that:
Hiro could actually be Kensei, Hiro's Japanese sword-wielding hero? 
EDIT
Well there goes my theory! Eriko Tamura eh? Possible love interest for Hiro?