I'm probably in the minority here, but I hate guys with untucked shirts, especially worn under jackets/blazers. Haven't these guys ever heard of tucking in and wearing a nice belt?
You are right. It's classless. Damn, it's weird that a place as small as Sweden is one where a fairly large percentage of people (at least in Stockholm - around Stureplan) have good fashin sense. Come on guys! Untucked shirts (and at that, shirts with soft, non-rigid collars - YUCK!)? Baggy jeans? Come on! I'll say it again - from what I've seen, the only good dressers on the men's tour are Federer and Feliciano Lopez.