In my not humble at all opinion - user expectations sank to absolute lowest minimum.

Oh my, for example I never asked for smooth scrolling (I've actually disabled it in browser), instead someone insists on it and forces that on me with some javascript. Thanks, but no thanks.

I can't even have my own scrollbars from system theme most of the time (why even this?!).

What we have now is ultra slow interaction because of tons of JS. Constant cpu usage and battery drain. And most importantly boundless memory hogs such as oh so great interacting facebook that easily eats 2.5gigs of memory.

And don't get me started about "effects", animations, fades, stolen keyboard shortcuts, right clicks and every other bit that throws accessibility out of the window.