We personally have yet to find a character made by someone else that we could satisfactorily play. There's just too many things that are unique to the "owner's" style. That doesn't say such a character can't exist, but rather that we've not found it.

We'd not mind playing with someone else playing a canon character provided they actually manage to play it correctly. If they don't manage that, then we would rather not they try that. Seeing how most cannot do such right, we generally stick to OC only... After all, that saves the problem from starting at all.