The second part of my comment that didnt seem to made it on the first try :
And then you hear someone saying, but hey this is a huge game theres no way they can find all the bugs and exploits, but well they should at least try to concentrate on the content that is the focus of the majority of the players(heroics, raids, class mechanics).
And so the PTR itself would be a great place to do that.
About the class imbalances, the thing when they removed arp, and didnt buff those melee classes wich were relying on it, well that showed me how much the game designers concentrate on this aspect of the game(Im not trying to be a troll just pointing out that there are several fairly obvious mistakes being made from time to time, and that these could be avoided if the develorpers were to spend a little more time thinking about the impact of the changes instead of just throwing em at us).
Uff, i spoke.

I'm quite certain no one sent a brand-new 80 into Vash, based on the number of corpse runs I made in the first hour I was there (if not for all my heirlooms being damage-proof, my repair bills would've been enormous).

Seriously, if you're going to create two entirely new races AND implement a 90% xp cut on anyone willing to enter a Wrath heroic the moment they hit 80, don't act surprised when some of the people entering Vash or Hyjal have an average ilevel of 170. And to add insult to injury, us constantly-endangered noobs have to spend a half-hour doing quests for gold before the quest-givers are finally willing to toss us some new gear.

Thanks for making me feel like a mercenary, Blizz, and a severely undergeared one at that.

This is exactly the point that Frost is trying to make. If people don't understand the point of the PTR or Beta they are wasting Blizzard's (and their) time. If more people understood that the PTR and the Beta weren't for happy fun time but for testing the changes blizzard could potentially have smoother releases.

@SamLowry I agree, that zone was not balanced for people freshly leveled to 80. I went in with Wrath quest gear, and got my, er, hat handed to me multiple times. And I spent several hours there and only got _one_ upgrade-- my shoulders.

It got so frustrating (due to this and the way the zone is laid out, and other issues) that I got my seahorse and left. Went to Mt. Hyjal and never looked back. Got fully re-geared within a few hours, it seemed.

They need to have pre-made characters that aren't tricked out in awesome gear when the PTR is testing things like this. They specifically should have had some lvl 80 pre-made characters with Wrath greens and blues, just to make sure that people leveling through WotLK content and going straight to Cataclysm, wouldn't get torn apart.

Sorry, but nearly all of the deaths my toons in Vashj'ir were due to not understanding the zone (there's up and down to deal with too!) and accidentally overpulling as a result. Once I got used to the zone and how it works (especially once one toon finally made it to the end), it was a breeze and I've taken all my toons thus far through it.

Does that mean it's easier than Hyjal? No. Working in 3 axes is always more difficult than 2 (or 2.3 given terrain?). Still, that doesn't mean it was overtly difficult, and honestly I now prefer it over finding a mob in a cave crowded by those who are scared of Vashj'ir.

Also, quest rewards only 2 or 3 item choices per quest. Thus some get geared sooner than others. When I was on my shammy I kept seeing all this amazing hunter gear and was getting nothing towards the end. I hopped on my hunter and soon realized that most of the earlier gear was for shammies, so i went longer for the good stuff for my hunter. By the end of the zone for both, both were fairly evenly geared.

@Sam

Be thankful that they didn't keep the damage output of mobs as high as they did in the beta. You thought it's bad now? If you were melee, every pull you had to pray that you didn't get an extra mob pulled. Remember the quest where you had to kill the little octopus guys with the caster naga? Yeah, they would both cast mind flay, and each one was ticking for 5k a piece. It was a nightmare.

Bapo, I just found it painfully odd that I was constantly slammed from all directions in the Vash starting area, yet once I moved on to the next hub the enemy density was far lower, and it remained that low for the rest of the zone. That makes no sense at all, considering the devs should've known undergeared players would be starting off at a disadvantage to begin with; parceling out new gear only much later on adds even more insult to (repeated) injury.

Simple solution? Make the eels yellow. So why didn't any of the devs think of that?

The devs were thinking that they made gear so easy to get that most people starting cata would have 251s or wouldnt hit 80 for a few days to weeks after cata came out. They did balance it to make the item level of quests on the way to 80 make people end up at around 264 ilvl.