Service:
I only have a little bit of lag every now and then, but that might have something to do with my slow 4GB connection as well. I might try to tone the graphics down a wee bit to see if that helps. Obviously, there have been a few server down-times, but that's only to be expected at a launch...and even more so for an early-entry launch.
Graphics:
I've just got a new graphics card. It's a lot better than the previous one but admittedly, not the best. The eye-candy is very nice indeed. Environment is beautiful and dynamic, characters and their equipment/armour are very attractive (you can even strip your char down to only a teenie-weenie g-string and no top

Classes: (I've only tried 2 so far - Bear Shaman (lvl6) and Demonologist (lvl 11))
Sham: Pretty much like Friar in DAoC - a lot of mele-ing but you get your main healing spells at about lvl 17 (according to the Abilities calc). I've not played it much, but it seems quite fun.
Dem: This is all mage - just boom boom boom

PvP
Admittedly, I've not done much of this. I've had a couple of fights solo vs 2-tanks/rogues. They jumped me the 1st time and got me. The 2nd time, I jumped them - got the one and nearly the other. The system seems good, as far as I could tell, but can't really make a great opinion without more practice and some grouping. The nice thing is that you have Day-quests (pvp and gen. community) and night quests (solo). It's not a matter of waiting for night or day, but rather going to the relevant npc and indicating if you'd like to switch from one to the other. This really helps if you're frustrated with pvp and just want to quest in peace for a bit till you level up enough to feel confident again.