I think they've got the balance right in this game.
In EMI he was hopelessly weak and dimwitted, but he was utterly famous (Planet Threepwood... *shudder*). In this one his character is a little more realistic (that is, the fact that he always accomplishes what he needs to accomplish no longer coexists with him being retarded), and so far there has been one person who's heard of him, and let's hope it stays that way. I want them to go to Planet Threepwood and realise that it's all about a different Guybrush Threepwood so my soul can rest.
Guybrush Threepwood shouldn't have more than one (maybe two at a push) fan(s), but he shouldn't be an idiot either.