I dunno I feel like the combat is slow too, even in comparison to D2. Every class I played felt as graphically satisfying as playing a barbarian in D2. A few streaks of color here and there but not a whole lot of feeling of power or impact. The general starting attack speed for all classes feels slow as well.
I don't think the art style is bad at all, a little too flat overall for me in color but the style itself looks fine.
I'm not arguing the fact that they're different games, I really wouldn't even compare them on "which is BETTER" basis, that's why I just said I can still play D3, PoE I just can't get into. I think PoE has some really interesting ideas and some of the art choices I like better (some not all) but it falls flat on a lot of areas though in my opinion.