Perhaps he is not tuned for 40. He might be tuned for 25 well geared man raids, but he can be zerged by 40 man poorly geared raids.

Depends on the loot he drops. The fact that the old kazzak had a hard limit on the number of players who could engage him at once makes it seem that the new kazzak has been tuned for 40people as they both have similar abilities.

And it would be easy to team up with another guild. I don't think any of the issues mentioned above are really a factor. I have killed every world dragon and azuregos multiple times with cross guild groups. I don;t see Kazzak being any different. We just may need to gear up a bit more though =).

Does anyone have any knowledge or guidance as to the order to best attempt instances in Heroic mode (easiest to hardest etc.)?

Aside: I'm on the US Nazjatar server but that doesn't appear as a valid option under profiles.

According to Furor Hyjal and Black Tempel drops tier 6, TK and SC tier 5 and tier 4 is dropped in Karazhan, Gruul's Lair and Magtheridons Lair.

PS. There are a few realms missing from the realm list in the profile settings. :)

The impression I got was that the heroics would follow the same difficulty progression as their non-heroic counterparts, with Ramparts being easiest and stuff like Arcatraz/Black Morass being the hard end.

Karazhan is the only 10-man raid dungeon, but it's a little deceptive, because it's much, much bigger than any of the 25-man dungeons. Add up all the 25-man bosses through the end of Tier 5 (Magth, Kazzak, Doomwalker, Gruul's Lair, TK25, and Coilfang25), and it comes out to around 13 total. But Karazhan by itself has 12 boss encounters.

The equivalence changes somewhat when the Tier 6 raid dungeons Black Temple and CoT Hyjal come out; but remember the 10-man Zul'Aman (presumably the next step up from Karazhan) is slated for release soon as well. So far, I think Blizzard's done a pretty good job of balancing the amount of 25-man vs. 10-man vs. 5-man content in the expansion.

Think of Karazhan (and Zul'Aman, when it comes outs) as the old ZG/AQ20. Mag/Gruul is roughly equivalent to the old Onyxia, albiet might be a bit harder. Vashj/Kael the old MC/BWL. Hyjal/BT would be like old AQ40/Naxx. Not so much talking in absolute difficulty, but in the progression sense.

Due to the lengthy keying requirements, it might be a really long time before you ever see organized pugs running some of the 25 mans, but certainly not out of the question for Karazhan for example, once all the strats become well known and everyone well-geared from the 5 mans.

You guys do know that Kazzak only berserks for about 10 seconds right? Then he goes back to normal mode.

Survive the berserk and kill him in 2 minutes. The only really hard thing about doing that is preventing explosions from running low on mana then detonating your raid for 5k with a knockback. But yes, 40 people make this much easier as we killed him about 3 seconds after he stopped being berserk. I do think he is doable by 25 right now though if you can handle the mana drains.

we had a full 40 men raid teamed up with another guild and killed him on thursday, its possible to do it with less but will need better gear for it, atm Kazzak is just one retarded DPS-as-much-as-you-can-squeeze-out-in-1-minute-before-he-goes-supreme fight

How do you guys deal with loot? Considering only one raid will get it, and you can't exactly rotate a raid boss, as he's open to everyone.

As far as I can tell, Heroic instance difficulty is more about boss mechanics versus group setup than anything. See the discussion in the other thread about Omor for details. With 4 melees and a single healer, we needed a significant amount of luck to win. With a stacked group of tank, a shadow priest and 3 other ranged dps, it would have been as easy as on Normal. I'm sure there are fights that act similarly towards other group setups.

A "progression path" for the heroic 5-mans is probably not going to be very reliable, since it will rely heavily on your group setup.