This is just the tip of the Icecrown (pun intended).
Here is the summary of the complaints.
"I can't believe you get to kill the Lich King in the 5-man (note: likely not true), you should only get to kill him in the 25-man raid. 5-mans and 10-mans are for pussies, RAWR EPEEN RAWR, Arthas is too cool."
"I can't believe people doing normal dungeons can get raid level gear, you should make people have to do raid progression to get epixxxxxxx. How dare you decide that the elitist structure of raiding that has persisted in WoW before is a bad thing, and allow more people to access this cool content that you spend so much time on. I don't like change! If other people have good gear, how else will people know that I'm the 'coolest guy ever'. You should have to spend copious amounts of time w/ assholes like me to get the good stuff. RAWR EPEEN RAWR" I would just like to note the armory profile of the complainer http://bit.ly/1sARtE . Looks like emblem and 5-man stuff to me.