Well. Without knowing what you're actually referring to - you might be generalizing quite a bit without actually knowing much of it. There have been some brilliant 2D games in the last few years and a lot of shitty ones as well.
People appreciate different things. You might not understand why someone would pay money for an absolutely stellar game like Ori and the Blind Forest. I, for one, can't fathom that people would go crazy over a fluffed-up product like Witcher 3, that, in all honesty, plays like shit.