Good combat/skills system, decent story, but locales totally ripped from D2. Act 2 was ridiculous. Caldeum = Lut Gholein. Simple desert maps, palace levels in the city, several sewer levels, and the sealed tombs of a powerful wizard? Jesus Christ, why the hell did it take them this long to copy/paste the locales completely? Luckily they left out the shitty jungles from D2 at least
Not much replayability though for me. Play through normal was fun, nightmare was just a speed grind, and I can't work up any ambition to play through hell on any character. Also, AH is almost necessary, since drops are utter shit (regularly getting crap blues 10-15 levels below, even on act bosses)
Very disappointing blizz. What they didn't copy from D2 they copied from WoW. Only redeeming qualities are simplified stats/followers and they didn't fuck up the combat - though it gets stale about halfway through nightmare