You could pick any number of combinations and do just great. The hardest camps in the game might be a push for some combos or at least less efficient.
Besides just kill efficiency keep in mind what people actually want to play. Do you need someone to pick locks? If looking to do dungeon adventures or just want mobility options having a porter/evaccer is very handy.
An enchanter and cleric are a nice backbone to any group
A puller: Monk, SK, or an ambitious paladin, or ranger is great if outdoor zones
Another melee: Rogues and monks are always good. Or another of the above. Warriors are just fine for dps or tanking, just are less able to slot into the puller role.
Past level 55 a mage can Call of the Hero your melee out of a dungeon if they bind at the zone in. They are a solid group dps class too.
Really you can make anything work. I’d just make sure people are playing what they want to play. It will be more fun and usually people are compelled to get better at their class and role. If you need a lockpicker that might push someone into a rogue. If you value mobility to/out of the grind spot maybe even a druid.
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