#1 and #4 (the not-great ones) were at tourist-prone areas. I wouldn't be surprised if that was part of the issue.
That makes sense (did you see all the touts in Vienna dressed as Mozart, speaking of tourist traps?) plus the holidays mean that just about anybody who wants a gig, regardless of talent or skill, can get one somewhere, right?
Anyway, sometimes seeing something bad helps me appreciate the stuff that is good or great more.