I was able to kill the Night Elf and Space Goat bosses no problem. The Stormwind king would be possible, but every time i tried it i get to about 25% and then all the alliance show up. If i had more DPS to kill him faster or maybe try it when fewer people are on it might go better. From what i have read the Ironforge boss would be a pain to kill as a MB. I think someone, maybe Mercucio? had some videos posted on some of the kills.