I've watched every episode but the last, and I'll probably watch that episode sometime today.
The plot lines are just as drawn out as last season's, but without the big catch-your-breath endings, the show leaves feels slower. The whole Hiro in the Past storyline has gotten old, and so have a few other storylines.
I agree that Hiro in the past got old fast, but it may be worth it to set up Kensei as the immortal Adam who apparently founded the Company.
Agreed that the whole past thing got tired, but I'm with Ray here - if it was all done for the set up as Adam as the founder (I didn't realize he was immortal - I just thought he had a similar power as Claire) then it will work for me. For the first time in a while I did not see the ending of an episode coming and this one had the exciting cliff hanger moment that has been missing from this season so far.
Oh, and Claire's boyfriend has "stalker" written all over him. His character annoys me.