Update from me.

Went into ZF at lvl 42. Luckily for me I dinged 43 at the start of the instance.

This has been the most challenging instance for me yet. The blood drinkers, and witch doctors require some thought for positioning every fight (god I hate using my brain) and the Hunters were just painful. I learnt to take the hunters down real fast, as if they Hex my pally who is my leader, the shammies just run around in circles following the frog, whilst I quickly remember what keybind I have to hit to change leader. If it was 1 or 2 hunters this is no problem, because you can just burn them down from distance and leave the aggro with the Shammies. The problem is when its 1 or 2 hunters with supporting witch doctor and blood drinker. This requires the pally to pick up aggro on the dr and drinker whilst burning down the hunters. Now for whatever reason, maybe its how the mechanics work, when ever in this situation, without fail my pally would get hexed. I guess its the hunters job to take down the one with the most aggro. I could get myself out of this situation, but it was annoying and usually resulted in one of shammies getting killed

I ended up clearing the instance at lvl 43. No good drops. Plan on running 2-3 more times before some easy quests around Tanaris and then off to Mara.

Im currently lvl 46.