Me and a friend of mine are trying to do some of the classic instances with our 60's alts. The thing is: while we can do Upper Blackrock Spire (10 man) with random 60's players, we are not going to get 40 guys for the large raids.
So, I'd like to know the opinion of people who already did:
Ahn'Qiraj Temple and Ruins
How many 80's are necessary to do these raids, while keeping them challenging?
It depends a lot on the boss and class. For example Skeram in AQ40 can be beaten with three people, but it's quite the RNG fight then. Doing Twins in AQ40 with three people is ludicrous tho'. Hakkar in ZG can be taken with two, but it's also the same RNG mess that Skeram is. With three people it becomes a cakewalk tho'.
ZG: 2 players up till Hakkar.
MC: 2 players should be more than enough, as most of the content can be solo'd
BWL: 3 players should be enough up till Chromaggus. Do take this with a handful of salt however... I was drunk out of my mind when I created a group for it.
AQ20: Should be as easy as ZG. We plowed through most of it with priest/pala. We had a DK joining later on due to the achievement of completing it tho'.
AQ40: Skeram is quite a PITA with few people due to his MC-ing. After Skeram it's a cakewalk till Twins tho'. C'Thun is also a joke at L80.