There's certainly a possibility that the Rams will select him #1. QB's always rise, and when Locker dropped out and Bradford reinjured his shoulder, Clausen jumped up to the #1 option. That being said, there's a reason the Rams are picking #1.
As for the rest of the draft class, Tebow isn't a QB (in the NFL), Bradford clearly has some injury concerns and worked out of a spread offense, McCoy has a weak arm and ran out of a spread, and Snead sucks.
Who else? Jarrett Brown? Meh. Robinson? Improved his stock at the Senior Bowl, but hardly franchise material.
Who besides possibly Clausen has the ability you look for in a franchise QB? They all have one or two things (particularly leadership ability in Colt and Tebow), but those hardly make up for the deficiencies.
I can agree that Clausen will go top 5. #1? Wouldn't be shocking by any means, but Suh still gets my vote.