Last week was the peak of his career IMO. About the only good thing I can say about him is that he runs fast for a big guy, in a straight line. Great for utilizing the rare mismatch by getting him in space, pretty much below average at everything else and makes Jerramy Stevens look clutch.
Despite his impressive outing on the whole last week I saw him juggle catches and whiff on blocks, and not just D-linemen blocks (there's not a lot of shame in that), he basically let a guy have a free run at Baldwin on 3rd down screen.
Those with hopes of him becoming our #1 TE should get rid of them, those hoping he'll stick around for a long time as our #2 TE are more optimistic than me about his development.
I do find it really interesting how much praise our FO have been heaping on him though. Pete's called him 'a heck of a draft pick', Bevell's praised him lately too. Normally they don't tend to gush over players and so this one seems kind of odd. I'm pretty sure they're not giving it the hard sell, I can't imagine Luke would draw a whole lot of interest. Maybe they are genuinely excited about his potential, I know they consider things like 'catching' coachable but it would be nice if Luke started to prove them right.
Edit: I also agree with Seanhawk, I've always said he plays really stiff, he's not the smooth/fluid athlete that many of the quicker TE's in the league are.