I did ramparts and BF at 61. I quested in hellfire to get all the upgrades i could get and the instances quests. I had no issues. Dying was due to my lack of experience 5boxing in outland instances. Since then i have learned how to play my team well and am doing many heroic bosses.

So YES! if your thinking about doing instances 4 shaman and a paly can't be beat, or 5 shaman. But expect to die! you will have to get used to playing this way. But you will get better! Its well worth it IMO.