Speaking from my limited experience (21 levels) of shamanism... Maybe.
If you wanna go smoothly you'll all have to do your roles very well. Otherwise you risk wiping when stuff gets hairy and you'll have a lot of downtime
[You must be logged in to view images. Log in or Register.]. Unfortunately I really do think you need another OH or a MH if you intend to have a group that can keep on rolling w/o having to stop for healer mana too often. That or else just be able to instagib and split pull everything (I've had a group with 2 mages, 1 enchanter, 1 monk, and a wiz that worked even though we didn't have a tank because stuff just DROPPED like mad)