Well MIB3 had like 1000s of flaws, but I enjoyed it. Avengers on the other hand was funny/nice only when Iron Man & Hulk were around. Was sort of boring whenever the focus shifted away from either of the two.
At the end of the day even I would want to be entertained. But at the same time, want some continuity as well.
Terminator series as well. I had high hopes from the 4th part, despite the 3rd one being average-ish. But got disappointed.Though you can say they tried to keep the storyline connected with half-baked links.