blizzard completely missed the mark IMO.
first they only did 5 levels and clearly there was enough areas/content to support 10 levels. you do your 5 levels and really only use like 2 or 2 and a half zones out of the 5 they added and the way they did quests means you had to follow the story line very specifically. i'm all for storylines but i think it shouldn't be so restrictive as they made it. they also went WAY WAY WAY WAY WAY WAY overboard on the phasing with cataclysm. they did some in WotLK and it worked but there were a few hints that it created problems (anyone remember trying to summon for raids when the first 7 people to the stone couldn't see eachother?). also, with mining/herbalism/archeolgy xp my friend literrally went from 80-81 with doing like 4 quests and just mining/archeolgy. i have an alt that did 80-81 by me logging in doing the JC/fishing/cooking dailys and never leaving SW.
they made the instances too hard. while i enjoy a challenge i much rather enjoyed the 10-15 minute queue time as dps from WotLK. hard modes are for the hardcore not heroics and normal raids and blizzard seems to have missed this. now they're nerfing everything after the fact to ease it up for players. they made tanking harder and they made healing harder and really for no reason. I've yet to find a single player to tell me they prefer the healing/tanking in cata than any previous version of the game and that's because it's not. for healing there's a fine line of making it too easy and too hard and blizzard took a sinlge step over the line towards too hard and they shouldn't have.
BG's are the same thing they've been since they were introduced. most people do it for the honor to purchase easy gear. sure there are those that play because they enjoy the pvp but not from my experience. in fact i only have 1 friend that plays that has ever told me he would quit if blizzard removed the pvp everyone else seems to ignore it and more often than not i am told by friends they can't stand the pvp and that it's just a waste of time.
archeolgy - this was awesome at first. the RNG has killed it for me and afterall.. it's just the remnant of the really good sounding path of the titans system which would have been a really good way to expand characters without levels... yet like all the other stuff i was originally excited about when cata announced it was all scrapped/changed beyond recognition.
guild levels was cool until half my guild quit because of cata content - they couldn't get gear fast enough because the content was too hard. we had 2 10 man groups and one finally just quit because they'd grinded everything they could other than the raids within a month of cata's release and the raids at the time with essentially all blues was too hard to make it more than halfway through any of the raids and people got bored.
storyline - this has been the weakest storyline.. wotlk was obviosuly the strongest as is brought the story that started with warcraft 3 to an end essentially. i mean, storyline wise wotlk was the end all be all of the story of wow.. cata feels like they're grasping at straws to give us a story arc and deathwing just isn't all that good. i like the idea of changing the world but it didn't turn out the way i had hoped i guess.
is deathwing still burning zones? i have friends that got killed by him and got the achievement and not me. i was in a zone once too where he struck and it didn't kill me.. not sure why. would be nice to have a way to get the achievment.
the new races... havent had a chance to start a goblin but worgen are really meh to me... no mount is dumb and i'm not sure if they did it for a "cool" factor or because they couldn't come up with a new mount idea.
all i see with cata is this expansion that COULD have been and is now what it is as oppsed to what it should have been. I have hopes for the patches that are coming but i'm not sure how much longer i'll be playing WOW if some things don't significantly improve for me.
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"...and they'll say "Hey, Look at him!, I'll never live that way". And that's ok they couldn't anyway..."