ToC was half-assed content, but I'm pretty sure it was intentionally so.
Err, ok that may be not a great way to put it, but it's pretty clear they by no means considered it an equal to Ulduar or ICC. ToC hard modes were good but it was still only 5 bosses in 2 total rooms. Easy modes were pretty ridiculously easy, though, and I think they messed up there. Heroic Beasts fight was such a ridiculous jump in difficulty from normal mode anything that it made for pretty terrible progression. My guild should never, ever be able to get our first kill of every boss in ~1-2 or fewer hours in 25 man... and I think I only felt a small speed bump for Anub himself which quickly passed.
RS was good (great? It's a sweet fight!) for what it is, but yeah it's still just one boss and some minibosses. Pretty inexcusable for the length of time ICC was current content. Cata comes December 7th at which point current raiding is T11 stuff. ICC T10 raids? Added in Dec 8th. 1 day short of a full year.
Even for my guild which ended up with having some unbeaten content left in Sindra, Professor, and LK heroic 25 it was too long... when Deathwhisper proved to not just fall over for us in one or two tries, the people that were tired of ICC week 35 or whatever just stopped showing up. They were interested enough for RS though...
I'm not saying they should've rushed Cata out early but the same thing sorta happened with Black Temple... they should start planning in extra time to finish stuff.
Just like I should plan in extra time to get to class when I'm typing on messageboards instead... gotta go! :p