My hunters are up to 56 now and I'm having a blast. So far they have been quite viable in instances with the pets tanking...but I expect this to change in the Outlands instances.

The best thing about hunters is almost zero down time - the only time i have to drink is becuase I'm killing stuff so fast that casting hunter's mark on each new mob is draining my mana too quickly lol!

Cheers,
S.