At present, due to the mid-boss' AoE attacks, folks tend to prefer one tank, minimal ranged attackers and massive quantities of healing as it is the path of least resistance.
I think it's more of the final-boss. Ogre is lol-easy with melee (I've always gone in to poke at Ogre with a pointy stick now, it's faster than doing it on Archer), but the final-boss is kinda tricky when it comes to dodging eyes, ghosts, pulling skelly spawn and evading Kamehameha. Anyway, that will probably change again soon in 1.19 like you said and will have more than just Bartraal to kick **** so it's O.K for you to play any classes.
If anything, my beef-ed up Chaos Thrust is equal to beef-ed up Trifurcate/2x Multishot. Edited, Aug 21st 2011 9:38pm by Khornette