More of the same, but that's what an expansion pack should be.
I would first like to point out that this is, indeed, an expansion pack, NOT a sequel. With that said, although the graphics engine is cartoony and starting to show its age a bit, there is nothing that can be done about it. As much as we'd all like this game to look photo realistic, it simply cannot be done with a simple expansion. The in-game graphics will not drastically change while this series is running on expansions, and that needs to be said so people stop expecting that to happen.
This game DOES add some nice new features for questing and raiding, not to mention the new Death Knight class. An expansion pack, by definition, is more of the same with some new little tweaks and added content. This is not a rebirth of a franchise and will not be something radically different and new. If BC was wearing you down in terms of interest, please do your homework, read what's going on in the beta MONTHS before release, and if you do not approve of the changes, avoid the game, its that simple.
Overall, this is a World of Warcraft game. It is not World of Warcraft II, it is just World of Warcraft. It is the same game you bought years ago with new content, a new class and new baddies to conquer. You should know already whether you will enjoy this game or not. It's clear that continuing fans will find something fun about this game and for those of you who no longer like this game, you have no reason to be buying this game and criticizing it the way you do.