Nonsense
I just wanted to share an expereince I had on sunday. My guild was doing some pop runs and we had a couple people call it for the night. Casting the net on guild chat we picked up a sorcerer and a wizard. This left us with 2 socrerers 1 wizard 1 cleric 1 paladin and a bard. This would not do. So we did some juggling of characters and came up with 2 socrerers 3 wizards and 1 cleric. Much better.
Laughing about it, we went in on elite to give it a try and see what would happen. Never had a faster or smoother POP run ever. One death (because the cleric was having too much fun using destruction). Took about 25 minutes (not a record time but we wern't trying to go especialy fast). Every room was easy as pie and the end took all of a 12 seconds to drop the WF.
We had a more clasicly balanced party before that and while we did fine, but it was much easier with the all caster party. My guild is not an elite fighting squad, were casual but enthusiastic players. None of these characters are sporting scads of raid loot or tomes on every stat. The sheer amount of CC or damage an all caster party can put out is insane! It boggles my mind how anyone can think arcane casters are weak.