I played as a Cleric and my INFJ best friend played as a Gladiator. We basically worked together and bulldozed most of the quests with me healing him and him owning stuff (This is what we usually do). As a Cleric I did really good damage, virtually never went out of mana, I didn't have to use any recovery methods from a full bar for about 45 minutes, and if you level up your mana and health shoots back up... so yeah. I get the feeling that Cleric mana is going to get nerfed.
But I did really good burst damage, did good healing, and could buff pretty well. The Cleric's damage seems based around burst, which is actually a very good way of making them since you can use your burst and then go back to healing people.
They have these things called chain attacks, which basically means if you do one attack that unlocks another ability to use only after that ability has been used. As a Cleric is was basically Holy Spell -> Instant Lightning Bolt thing, then I had this instant melee skill that slowed the enemy's attack speed by 10% and that would lead into another lightning spell that stunned for 5 seconds and did good damage.
Also as a Cleric I was in the 2nd best armor class with a shield, so I basically never died with that, my mana, and my good damage.
My friend pretty much owned stuff as a Gladiator though.
I honestly didn't try out any of the tradeskills, I just wanted to burn through the beta to get as high as possible to try out the class I wanted to play. When I got the beta it only had 3 days left, and then everything was going to get erased. So yeah.
I never lost a duel, lol. Everything was basically easy as a Cleric but it went a bit slower than the pure damage classes went.
The Assassin class is pretty much pointless, since the Gladiator does more damage, has more armor, and they are both up close classes. And their stealth makes you able to see them, they just become transparent but you can't target them (but an AOE attack gets them out of stealth easily). The ranger class on the other hand is ridiculous, they were the only people that I came close to losing to a lot.
We played on the good side. I tried both sides, and I would say the leveling on both sides seems even, there isn't a bias or anything for faction. The evil people look a lot cooler, I like how they run more than I do the good guys. We started on the good side because we had two real life friends that made characters on the good side, so meh.
The people on the bad side were immature idiots, and the people on the good side were more mature and actual conversation was going on in the global channel. On the bad side it was basically a constant flame war.