I was going to say Gilliam myself... conditionally. I love his visuals and sense of imagination, but at the same time every single movie of his I've seen goes completely apeshit in the last 20-30 minutes. In Fear & Loathing, at least this was intentional.
Let me reiterate though, I love the guy! Flame me not!
I do add my vote for Overrated to Schumacher's pile. I liked the Lost Boys... what have you done for me lately?