As a Chelsea fan myself, I can appreciate the qualities of Joe Cole. He is a hard-working, gutsy, creative player who can create goals and bag a few himself. Yet why am I not sad to see him go from Chelsea?
Quite simply, Cole is a very hard player to accommodate within a team, or at least a team of the quality of Chelsea where Cole's specific needs cannot be taken into account. He is not going to replace Frank Lampard in the central role and Flourent Malouda and Salomon Kalou possess the type of pace that make them both far more effective choices out on the wing.
The problem with Cole has always that he lacks the stature to play in a truly central role where strength is needed to hold up the ball, and the speed to go past defenders out on the wing. This makes his qualities more void as they are very hard to place.
The real answer as to where Joe Cole best fits in will be if he goes to a team intent on making him their chief playmaker. Arsenal may be a good fit if Cesc Fabregas leaves, but Aston Villa also seem like a good fit.
For his sake, I hope Cole gets given the opportunity to play where he believes he naturally fits, but whether he holds up as a team's creative creative force is another matter.