Willson is an intriguing player. Killer speed and size, but his upper body is so tight that he has a hard time catching balls from pretty much the numbers up. The way his body is shaped and the lack of fluidity in his upper body reminds me of the meatheads that have such large lats that their arms can never really be by down by their sides, they're always bowed out.
He especially seems to have problems when throws are contested or are coming in really hot. He just looks awkward catching with his hands. Compare the way Moeaki catches the ball vs. Willson and it's pretty clear that he's just not much of a natural ball catcher.
With all that said, he has still made some very clutch, tough catches in his first two years here. He has been a pleasant surprise for a 5th round pick that never got starter reps at Rice. But IMO, he still really needs to work on his blocking and pass catching to be a legit #1 or #2 TE in the NFL. I'd say he has been serviceable this season, but our offense would most likely be quite a bit more efficient with Miller (especially considering Miller's blocking ability) or McCoy available.
Our TE corps will be interesting to watch in 2015. Ignoring what we have in Miller and whether he'll still be on the roster next year or not, between Helfet, Willson, Moeaki, and the possible return of McCoy, there will be at least a couple spots up for grabs that could equal having some pretty good depth.