New for Cataclysm:-
Noooooooooo
Going to kill off 25man raids.
Wow thats one poor change, and this is coming from an extremely casual (at least these days I am) player.
There will be no-one raiding 25 mans anymore. Its a pretty well known fact that even in a well run guild a guild 10man will run a lot smoother than a guild 25man. There are always one or two who slack and accountability is a lot higher in a 10man.
If they are the same difficulty, same lockout and same loot, lets face it more dropping on 25man doesnt matter as there are less players in 10 so less loot doesnt matter, what will be the point in putting in all the extra effort to run a 25man raid? As far as I can see there will be very few guilds who will now bother with 25man content.
Was getting quite excited about Cata and pretty much everything I have heard about it so far has been positive and whilst the change wont effect me personally I see it as a very negative move by blizzard.
And more smaller raids? Personally I have found WotLK the poorest of the 3 WoW incarnations (vanilla, TBC and WotLK) I find the lore is pretty average, the whole there always must be a LK was just jazz. The dungeons are uninspiring and the raids are disjointed or poor. Naxx, poor. OS, poor. EoE, poor. Uld, good but where does this fit in with the LK? ToTC, **** poor. ICC, decent enough, best effort so far but I just cant get into it.
Contrast the above with TBC where the raids (discounting Kara which was epic in itself) were one big storyline. Maggy >>> SSC >>> TK >>> MH >>> BT it just seemed to flow soooo well with a great story arc continuing throughout. They were all fantastically designed, with the music being great fits too especially BT, and they were just so atmospheric and fun (and challenging but thats a whole different kettle of fish)
Now have visions of Cata having loads of **** poor OS/TotC style raids where you just nip in for 20mins kill the embarassingly easy bosses for your shinies and out you go again. Really getting me tempted to join an old WoW friend of mines twink guild who do 60 and 70 raids. Might keep my lock at 60 and level something else to 70 because at least I can enjoy them raids.
But meh what do I know

Blizz always ignores its subscribers anyway so I will just keep playing the parts I enjoy (levelling and lore)