ToC is a huge disappointment, particularly making us wait so long for the heroic mode. Blizzard clearly didn't have time to produce something better, and I guess the underlying cause is arena - the need to produce new content to match arena seasons means that we will, in mid expansion, get something underwhelming.
They should at least have given us a truly epic coliseum, what we got is more a back water amphitheatre. The Colosseum in Rome could be flooded for boat based combat and simulated sea battles, it had numerous trapdoors that allowed both animals and scenary to be introduced.
The Argent guys have both magic & goblins, but they still ended up producing something which the romans would have considered terribly old fashioned and dull.
Ulduar was an awesome raid, we still get them, but I guess we can only hope for every other raid to be awesome from now on - Blizz just don't have time to produce them for every season.