In case you are curious... I've got an Intel HT 3.0 gig processor, 2 gigs 400mhz ram, 1 tb hdd, a nVidia 7600GS 512meg video card. The game is set to highest settings with the exception of shadows (causes too much breakup with the drivers). There is some lag in large congregation areas, and as well as just prior to a crash due to a memory leak.
I was grouped with 5 others last night and we were ripping through a couple of instances. There was very minimal lag that I noticed.
As for gameplay, in the shots with the UI displayed you can see my hotbars (middle bottom of the screen). The 4 buttons on the left are my ranged specials, the 5 or so on the right are melee specials. The other bars have buffs, a pre-combat root, couple potions and swapping crafting tools.
Typical combat for me as a hunter is to pick a mob, fire a special that snares the mob, followed by a special that shoots 2 arrows. In there is also 1 or 2 auto-attacks. Very rarely does the mob live to get to melee range. If I see a couple of social mobs, I'll set out a root trap, then follow as above, the unsnared one (usually) sets off the root, allowing me to finish the other, then hit him while he's rooted. In this case I do need to resort to melee as the root will break on the first or second shot, but the mob will be at 1/2 health or less (unless my shots miss, which has happened a couple times).
Realize also that the hunter is the nuker class, so it may seem a bit overpowered. In fact I think it is, and will probably be nerfed in the near future.
Any other questions, post them and I'll do my best to answer.