Heh, I didn't even notice when Nate and Vanessa were gone for an entire episode a couple of episodes back (Nate's absence wasn't even explained?).. I think I might potentially like the Nate character, so it kinda bugs me that they can't seem to find an interesting storyline for him, but for now they're both just really redundant.
I used to like Lily and Rufus, but the whole kid-storyline kinda ruined them for me. Rufus started to really bug me more than usual with his whole insistance that they meet with the kid/family. It's called a closed adoption for a reason. But I like that Lily is sort of embracing Chuck, and I like her in general, so I'm not sure what to think about them, really.
Also, Dorotha makes me chuckle.