I'm really not liking the Hiro part this time. Hopefully it will eventually tie in with everything else that is going on. Right now it just seems like empty filler. And smells a little too "Back to the Future" for my personal taste.
Claire's man is definitely dodgy, but less so than I thought her father was the first season. There's so many grey characters in the series it really keeps you guessing. The only one who's proven himself totally dark would be Sylar, and Mat's dad is certainly looking bad too. For the rest they could be heroes or villains on any given day. Which makes them more relatable for sure.