saying it looks too slow based on an early dev trailer really isnt how things work. just compare tf2/csgo/ow/quake early dev trailers to actual gameplay
I like the art style/minimalism its got going so far but hard to tell if that'll stay. No real HUD developed yet so that can go south still. though imo if riot has been ok at anything over the years it's not having as much visual clutter like blizzard games and in some cases dota