I dont really understand how catalism is going to work (the world changinig and being able to lvl in the old world and such).
though i havent really read up on the new expansion - only what you guys have discussed on this forum.
Cataclysm will change the world for everyone, regardless if you have the Cata expansion or not. So there will be no "old world" only the reshaped Kalimdor and Eastern Kingdoms.
As far as whining and bitching about how everything used to be 'so much harder and more awesome', those people need to get their heads our their asses. 13 million people paying a monthly subscription so that 1% of wowers can see 90% of the content is completely stupid.
If this somehow makes you enjoy the game less then maybe you should think really hard about why you play the game in the first place.
1. You play for the challenge - This is still there in the form of hard modes and by admission of even the top guilds, HM are still as hard as anything that has come before, maybe even harder.
2. You play to see new content. - This is now a far greater reality than it ever was, and real life people, not just dedicated hardcore raiders, actually get to see it for themselves instead of on youtube clips.
3. You play to be better than other people. - If you doing hard mode content this is still the case, hell even normal mode content is still pretty exclusive for long into a tier cycle.
As for PvP being easier ... really ... really ... that is completely baffling. As far as I can see the complaint is that other people now have the audacity to fight you with equal gear. Since well it's still Player vs Player, the 'easy' as which you can get a higher rating is completely dependent on how you fare against other players, so I really don't see how this can get any easier from expansion to expansion.
The argument against hardmodes was also pretty nonsensical.
'hardcore' raiders will farm them mindlessly to satisfy some epeen in a raid which is still EASY but just requires better gear
I hate to break it to you, but wow is an rpg and in rpgs EVERYTHING becomes easier when you get better gear. Not to mention "mindlessly" farming items is what wow is about, you farm a raid to get better item to do the next raid. If you telling me that hardcore guilds didn't mindless farm MC, BWL and AQ for months to get better gear then you are really operating under some heavy rose coloured glasses.
I think though the real motivation for much of the criticism towards wotlk can be found in one line.
It made those raids an exclusive experience and you felt excited to be there because of that.
It's nothing to do with content being more or less fun, or requiring more or less skill to complete, it's purely the fact that these 'others' are now in their with you and you can no longer go "naana, look at these items I've got and you don't".
If other people enjoying the same experience as you is such a terrible and unfulfilling thing, then you better go preorder your copy of D3 and pick it up right from Blizzard studios, so you can play it before all those 'others' ruin your game.