Sucker Punch. Gets panned for having a weak storyline but I guess for me the storyline really isn't the point... the action is flawless.
Flawless. Also I get that some people don't like over-the-top / heavily post-produced action.
On the same note; Batman vs Superman. I still maintain that the director's cut is an excellent film, if you ignore a small number of glaring flaws:
1) Lex Luthor... who on a second viewing I didn't find that bad, just still not... well... Lex Luthor
.
2) Lois throwing the kryptonite spear into the water. Unfathomable.
3) "Hey ur mum's called Martha too? Cool! Did we just become best friends??"
BUT other than that
It beats the vast majority of the MCU for me.