So, I suppose, Deathly Hallows Part 2 also wasn't very well liked with 169/381 = 2.25 OR is it possible both films just met a ton of demand early... I honestly don't believe the film quality played much of role. While not as many loved it as loved The Avengers, I've yet to meet anyone that didn't like it plenty or, at the very least, enjoy it for what it was...
EDIT: I posted this before realized you posted again regarding multipliers. I agree. That's the case with Iron Man 3 along with some half decent competition.