I don't think a melee raid group will work. In fact I would say it would be impossible. IWT is finicky in PvE to say the least. Hit it at the wrong time when the mob moves and your entire raid is running off into the wild blue yonder forcing you to spam IWT to keep everyone hitting the target, albeit inefficiently and to keep everyone from running out of command range. Then you have to hit everyone follow me, pull everyone to you including anything you are fighting, and hit IWT once again to get everyone facing the target. Adds? Forget about it, you will just get overwhelmed.

Stick with ranged DPS IMO, use hunters for your physical DPS, and casters for magical. Only melee should be your tanks.

I think if you follow this approach you will avoid many, many headaches. Unless your entire raid are prot paladins. Then you just run in, and put WoG on round robin ;p