The classes are quite nice, I preferred to create a character that worked best with what my clan mates had chosen.
By choosing witchcraft on my archer/melee (old habits die hard), I was able to bind an enemy, and if I was low on health, pop another skill that would combo with the bind, healing me or, if I was doing fine, I could tell my brother (a paladin type) to use a skill (I forget its name) that would cause a stun to proc, alongside the damage.
Really benefit being able to talk on teamspeak in those procedures, but after a short time, he would know when to do his skill based on the cast animation & whether or not I had a good amount of health. I like that idea a lot as it not only allows personal combos, but others can capitalise on it. Much easier with a smaller group of people (we four manned a lot) so it's nice to see a player and know exactly what they were capable of and how to bounce your own skills off them.
I'm sure there are other games that have done something similar, but I enjoy it.