Muhammad doesn't cut a particularly sympathetic figure for me, but I try to suspend judgment on founders of major religions I don't practice. I'm more than a little concerned about the current Afghanistan situation effecting a sort of "reset button" to the early 2000s when the crassest sort of anti-Muslim rhetoric was à la mode even among some left-liberals, and I want no part of that.
For what it's worth, I still think the predominant view of the Afghani people, right now, is as unfortunate supporters of America, who got unwillingly taken over by an extremist force. This has nothing to do with Mohammed himself, who I see as a HP in almost every regard.