Its just not worth trading Mallett unless they get a good 2nd or more. I'd rather hold on to him as a good back up or maybe take over for Brady if something happens. He is one of the rare backups that could be a good starter so if I was the Browns or Arizona I would try to pry him away.
I like Mallett more than this drafts crop of QBs. Him not having drug problems so far really helps his stock. The drugs were the big reason he fell and him not having issues so far dispels that worry. Mallett could easily fail still though.