I've got a couple.
Goosebumps (the one with Jack Black)
My husband started watching it on Netflix and we tried for a good 20 minutes, but it was just so darned bland, processed, and boring we stopped and watched something else.
Hickok
I thought it would be a neat Western romp, but jeez, the main character is boring, no investment fostered at all for his character or what he was doing, the cinematography was mediocre; I just couldn't find any reason to continue watching.