My "levelling pre-existing characters and catching up on fifth Shaman" group is as follows :

- Padadin tank (my all time Blacksmith, I was not going to level that on another character)
- Shaman healer (the one that got kicked of the 5 x Shaman group when reaching 60 and replaced with a Paladin)
- Warlock (my old time trader that got RAF level gifted, I just felt like trying a Warlock)
- Shadow Priest (one of my old characters, always played her shadow)
- Rogue (old character also, nice to have to open boxes/doors)

I thought it would be hell to manage, but it's in fact quite easy.
- On pull button : freezbee on the Paladin, stealth on the Rogue, de-activate /autointeract on all but the Rogue
- On Tank/DOT button : Paladin builds up aggro while casters drop their DOTs, the stealth Rogue starts moving towards the target in stealth mode
- One DPS button : Casters do their thing, and Rogue throws everything she has in a probably rather non-optimal /castrandom
- Some heals for the Shaman

So really, I don't think a Rogue based group would be that hard to play anymore. If I would not have so many groups to level already, I would like to try one, actually.