I would agree on a few of the points above.
1. It's rare that we see him in a route that's >10 yards. His TD this year was perfect execution, and exactly how we should use someone with his size. But the rest of the time, he's running three yard outs and someone his size wouldn't be difficult to cover in that area. Get him moving down the field, and I think we'd see a better player.
2. The drops have hurt. Doesn't seem like he drops when he's wide open, but more when he's pressured a little bit. Seems a bit odd cause he seems to have massive mits and appear like he should catch everything. But he does need to eliminate the drops, though he's not alone on this team.