He's an interesting one. I think he's a better fit for the league than Pirlo, at least until he can't do it physically (which could be now given the injury).
He had a strong year at United before getting hurt. Perhaps the best analogy would be Drogba in that, if he recovers from the injury, I could see him bossing games for a while because he's extremely strong but also more skilled that nearly all MLS players.
But, at that age, it can go fast. Drogba had an amazing half season for Montreal and was arguably the best player in the league for those 3-4 months, but then, within a year, he's an albatross. If any team goes after him, I think you need to keep the contract short.