It was some interesting ideas badly implemented.
Cata heroics, okay cool they tried to make 5 mans harder than wrath, oh wait they put them in LFD which formed groups that flat out sucked.
Joining 10/25 lockouts and sharing loot, okay cool let’s bring some prestige to 10 mans by giving them equal loot/achieves etc… oh wait that killed a lot of raid pugging going on as there were simply less lock outs to go around.
Guild perks, hey cool let’s add something nifty for being in a guild, oh wait swarms of people joining mega guilds solely for the perks which were kinda broken…
Changing the badge system from raids/dungeons from boss drops/daily quests to a a weekly point cap, nifty no need to worry about missing a day logging in, ah right a massive increase in raid logging along with joining lockouts.