what games did what wow does better than wow does it?
Most other MMOs, actually. The issue is that Blizzard has Warcraft on its side. See, they created a brand recognizable with their humourous and quirky little inserts in the original series. And adding pop culture references in the MMO just helps them.
But mechanically, WoW is a MESS. It's got memory leaks in just about every major city that they never fixed, and until Cata (Which is essentially World of Warcraft 2) there's at least 7 instances/dungeons that the never finished and which they're finally doing something with with this expansion. Also, as for Diablo 3 copying WoW, I am going to laugh REALLY HARD at ANYONE who says that. Because WoW copied Diablo TWO.
Oh, you ask? How so? Well, for example, and I'm going to pick on the class that shares the most with it: The Warrior. You mean to tell me that Thunderclap isn't like the stomp? Or the various Shouts that the Warrior gets? Or even MORE obvious, Patch 3.x.x's new Fury Ability for Warriors to use a two handed weapon in EACH HAND, isn't a direct rip from the Diablo 2 Barbarian??
And let's take the Paladin. The Auras sound pretty durned familiar, don't they. Kinda like the Auras the D2 Paladin had right? But nah, must be a direct rip from WoW to use in Diablo 3. Where there ISN'T a Paladin in the game...
WoW, sadly, is a bog-standard MMO with low resolution graphics, minimal animations (Each race has the SAME special power animations, usually one for melee, and two for casters, no matter what class you choose, except for the Rogue's Mutilate) and buggy gameplay. But because it has a Brand backing it, and one they know how to market exceedingly well, they'll keep making money.
Besides, their best teams left years ago. Blizzard North, and the team of excellent balancers that broke off and made ArenaNet and Guildwars.