Priest + 4 mages, questing

[RSM72]

Will a group of 4 mages + healer be able to do dungeons as well?

If I'm correct I've seen someone doing even heroics with 5 mages? If so, does it mean it's doable or is that person extremely skilled and it's actually very very difficult?

The 5x mage thing works because you are able to burn most bosses down very fast. Some even before they use their abilities. Going 4x mage + priest will reduce your dps by like 20% and thus make that strategy somewhat harder. I did blackrock caverns in a 5 mage team several times to farm faction and that is somewhat easy but I still think runtu (the guy doing the videos) is really skilled.

I played a team of 4 warlocks + priest to 81 and successfully did almost all pre-cata instances with that team. Had to return 1-2 levels later to complete one or two because some bosses are very hard for a 5x caster team. Having 4x soulstone available really helped with not running back in case the healer died.