He was a physically gifted receiver.
However, there are factors that suggest he won't be a factor anywhere he goes:
1) His age has lessened his physical gifts.
2) After getting paid by Dallas, he mentally mailed it in. You get paid that much, you don't mentally check out.
3) His refusal/inability to learn good route running. Because of this and number one, he is not one of those receivers that will kill it into their 30's.
4) That injury. It's a rough one to recover from, especially the older you get.
5) His mentality. Not every team can handle how his passion for the game and winning manifests.
Maybe he'll prove me wrong and comes back a totally different player, but I doubt it.