Me and konnichiwa tried a few bosses back at 70, me with paladintank + 4 shamans - he with 5 shamans. I i remember correctly we took Garr, Shazzrah and Baron Geddon.
Now, at 80 i did my first run to MC few days ago, only bothered to take Geddon, since i still want my Thunderfury. Went smooth, paladintank and 4 shamans.
Edit: About luci, Can't really be that hard to nuke his MC-priest if its 90k HP, if ur running 3/4 dps that is.