My guild does what we call "Flashback" raids, about once a month. We hit MC recently with around 10-15 peeps and cleared the whole thing including Rag. The Quin-thingy is a 1-hour cooldown, so we just swapped in some pre-BC alts that already did the quest line, and was able to kill all the runes. Suffered two wipes IIRC.. once on Baron Geddon, but was able to kill when tank was in 200+ Fire Res gear (also used with Rag); second wipe was on Shazz due to the debuff and porting on folks.

IMO a 5-boxer could do some of the bosses, but not sure about major domo and his 8 friends.