I've only reached level 23, but have been thoroughly enjoying it so far. Usually end-game is the real test, but by most reports finishing the campaign is ~40 hours of gameplay alone. Given the hundreds of hours I sank into D3 it was an easy buy for me.

edit: also the in game shop is totally ignoreable. Currently it isn't shoved down your throat, you have to go looking for it. Given it is 100% cosmetics, I'm not fussed by it.