Seeing as how arena's in wow has homogenized the classes, I am glad there are no arenas in ESO.
I much preferred the vanialla wow where classes were distinct, and alliance had paladins and horde had shamans. Now, when every class have everything and every faction have everything, then everything is the same just with different skin and visual effects.
Just for the records, I am not opposed to arenas in itself, nor to small structured pvp, I quite like it, but I am opposed to catering everything in the game around arenas, and strongly opposed to the arena grind that is wow (grind for rating and to cap weekly points, miss out on a week or two and you are behind everyone in terms of gear).