It is a gimmick, why the hell can't you understand?3d movies are more of an event where you get the popcorn out. You would not watch one casually, but that does not classify it as a gimmick.
It gives me headache, the quality is terrible, etc.
What really grinds my gears is that every good tv is 3d. That means i have to pay for something i'll never use. I have 4 3d tvs in my house and i always watch 2d stuff.