Soooooooo many people seem to bitch and whine about how horrid WotLK is and how easy hardmodes are.
First off, if you're bored with how easy the game is blizzard made something just for you HARDmodes. Stop the bitching please.
Now lets gets back on topic: WotLK, blizzard's guinea pig.
So WotLK introduced a LOT of new features into the game, if you think about it, WotLK sacrificed itself so blizzard could test out all of their new ideas which they have stated they have, for the most part, perfected and plan to impliment into future X-pacs.
Some of these features include:
10 and 25man raids for every raid
Hardmodes
Vehicles
Destructible buildings
A new class
Passenger mounts
Acheivments
A decent emblem system
Weekly raids
Random Dungeon finder
Made more specs/classes feel useful
More diversity when it came to loot
and most of all: Phasing
Blizzard had to test all these features and more somehow in order to perfect them, yes some arnt really balanced like we want them to be. But think of it this way, Blizzard had to and wouldve tested these features out eventually, i'm just glad they did it now so that things will be better in the future.
Think of it this way, WotLK took one for the team, blizzard tested many new features out on it and perfected quite a few, this means we can expect even better, more enjoyable X-pacs and features in the future. I hope that Blizzard puts a lot of time and manpower into Cata and all their future X-pacs. I cant wait for a WoW newer and better than ever before.