Way back in the early days of mock drafting, Keenan Allen was a pretty popular name. However, even then he was a polarizing prospect. His game isn't conductive to a March draft stock explosion, so he's widely been pushed to the side by other, faster receivers in the draft.
Let's see if that's warranted...
Physicality: Allen is a beast when the ball is in his hands. He is tough, strong and physical and has no problems with contact. In fact, that's one of his premier traits- he's able to beat out defenders due to his strength, something incredibly rare in this draft class.
Focus: Allen really didn't any other option in this regard; his quarterback was taking notes from Mark Sanchez on a daily basis. He displays good vision, good awareness, and will go get the ball, regardless of where it is and who stands in his way.
Polish: Allen is physical and focused, and displays good football intelligence. He doesn't have straight line speed to burn defenders and isn't the most exciting player, but he plays his game and plays it well. He's a good route runner and has burned more than one cornerback on a double move.
Speed: Allen doesn't have top end speed or athleticism. While he is fluid and smooth, it's clear that there are limits to what he can do physically in terms of explosiveness. That doesn't help his stock when the numbers become the last thing people remember.
Hands: He has better highlights than most, purely out of necessity, but if there is one negative to his consistency and polish, it's his hands. He's dropped a fair amount of passes, but I'd like to see him with a real QB before any decisions are made.
Keenan Allen is the best receiver on my board, and for good reason. It's true that he may not be the best fit for the Rams, unless they are ready to give up on Brian Quick, but Allen understands his game and plays it well. He's physical in his play and smooth in his cuts.
If he can iron out his drop issues, he can become a monster in the NFL. The problem for the Rams is that so could Quick, and it doesn't make sense to have to young receivers with the same game on the same team (at the same time).