Btw, Mandokir should be soloable if you have enough gear to burst him down (and use DB for decapitate for 8 extra seconds).
However:
I don't know if you know me - but some infos about the cata bosses:
T11
- Omnotron Normal killed:
http://i.imgur.com/bIcoF.jpg (HC should be possible, will try it next ID)
- Magmaw Normal killed:
http://i.imgur.com/Uo9Ym.jpg (Oh how I hate him, I don't think that HC is possible with T14 gear, but I will look)
- Chimaeron is not possbile as warlock
- Maloriak Normal/Heroic should be possible but I didn't try it at all.
- Atramedes Heroic killed:
http://www.youtube.com/watch?v=koGRs8FFtw4
- Nefarian Heroic is impossible but Normal >MIGHT< be possible, we will see (maybe not until T15/T16 gear).
- Halfus Normal killed:
http://i.imgur.com/xSUMn.jpg (Heroic is not possible until we have T15/T16 gear, maybe not possible at all @90)
- Valion & Theralion Normal killed:
http://i.imgur.com/ts20e.jpg (Normal version is a joke - Heroic is possible but I didn't try it)
- Ascendant Council should be possible on normal mode as tank demo lock (impossible as aff without spell lock + the debuffs tick REALLY hard)
- Cho'gall Normal could be possible als tank demo lock, didn't try him yet
- Sinestra is impossible as warlock
- Conclave of Winds is also impossible as lock
- Al'Akir is easy killable as lock (First time I killed him it was with iLvl 460 and btw HEROIC is possible - will try it next week!)
T12
- Alysrazor is a joke at 90 (
http://i.imgur.com/IYrhG.jpg - Killed her on the first day at L90 with iLvl 435 or so - btw mount dropped on the second kill
) and heroic is doable.
- I don't know if the other bosses are doable, but I don't see it why not. Baleroc and Shannox might be harder then the rest but hey, nothing is impossible :P
T13
- Morchok, Zon'ozz and Yor'sahj have already been killed (and gratz to you guys, I didn't try it and won't try it until I'm finished with T11/T12)
- I wouldn't say that Hagara is impossible (Our pet can kill the tomb & if it hasn't been changed then our pet could also be used to activate the totems)
- Ultraxion is impossible with T14 gear, maybe doable with T15/T16 gear.
- As it has mentioned before: Blackhorn is maybe doable.
- Spine - tbh I don't know if he is doable or not.
- Madness could be possible.
Feel free to ask if you have some questions about some bosses or if you think that some bosses are impossible or not or lets just discuss the one or other thing.
So long.