I really feel that the designers put more effort into Ulduar than ICC. Not only is ICC more or less staring into one bland room compared to the extreme variety that Ulduar had just by moving from room to room, it just seemed like another ToC - another instance to buy time until the expansion. Ulduar had this certain feel to it, of just pure epic-ness that Icecrown really doesn't. Even with ToC going out as early as it did, they still couldn't make Icecrown surpass or even come close to, in my opinion, Ulduar standards.
What do you guys think?