The best crappy beer has to be Blue Moon since it's owned by Coors. I'm still baffled how they they get the horses to piss in the cans.
Hey, the thread title contains the word "controversial," so let's dance.
I think 80% of Blue Moon hate comes from two facts:
1) It's made by Coors.
2) It's labeled as a Belgian Wit
If Sierra Nevada brewed the same beer and called it an American wheat, it would be accepted by most beer geeks as a decent if underwhelming summer session option.
Flame away.