I look at Manziel the same way that I do with any other player, it is a risk/reward decision. With Manziel I highly doubt that anyone will give up a 3rd round pick for him. Its not only the pick that you give up to get him, if you trade for him, you also take on his first round contract.
I don't think we would pay him first round money to sit on the bench and accept the risk of his antics. I think Cleveland will cut him, eventually. If so, he becomes a little bit more of an enticing risk/reward proposition, but the smart money says that he will always be a problem off the field due to his personality. It doesn't matter where he goes, his personality (disorders) will not change. The best you can do is to manage personality disorders and that is exhaustive ........and never ending.