They always shipped WoW with bugs and unfinished content, I don't see why it's such a big deal.

When TBC launched, the much-showcased netherdrake flying mounts (and the quest content associated with them) was MIA, raid bosses weren't tuned (Gruul 1.0 was nearly impossible for most guilds) and Hyjal wasn't ready so they bugged out the bosses (or put them on supreme mode).

So what, right? Patch 2.1 that fixed all that stuff came out nearly 5 months later, raiders were pissed but that's always a vocal minority, most were just starting to out-gear Karazhan or were still progressing through SSC at that point.