One of the best teams I've played was 4xHunters + Healer. Such a blast. Leveled them to 80 in instances, piece of cake. Then the wheels fall off and the composition turns to crap...

Do a search on Hunters with me as author for the full rundown.

Don't waste your time if you want a viable PvE or PvP team at end-game. If you insist on bashing your head against the wall, drop a hunter and put a healer in as your main. Even then, be prepared for disappointment long-term.