If you're going to complain about the challenges in WoW, please tell me you've done all the hard modes in 25 man Ulduar, including Mimiron (Firefighter), Freya +3 Elders (Knock, Knock, Knock on Wood), Algalon, and Yogg-Saron with 0 keepers up.
Unless you are/were in a top 100 guild, you don't have Algalon or Yogg+0 down in 25 player mode, because they are exceptionally challenging, and dare I say, fun encounters that actually require a raid with some semblance of skill/attention/situational awareness.
And for Colosseum, they're only releasing one boss per week on the normal (easy) difficulty 25 man. Once all the bosses are out, and it's been cleared, the Heroic 25 man (hard mode) difficulty unlocks, and until you clear that, there is no room to complain about challenges.
I'm sure Icecrown will be the same- an easy 25 man mode so the casual players get to see content, and a heroic 25 man mode for those looking for a challenge and better loot.
I do find it funny when people complain about content being too hard (OMG NERF!), and when Blizzard releases easy modes for new encounters, those same people complain about things being too easy. Can't have your epic cake and eat it too.