I bought GW yesterday at CompUSA and installed it last nite. Got my ranger/monk up to lvl 6 before I logged off for bed, so here's the impression of someone who played it
Frankly, it felt so much like Dungeon Siege it wasn't funny. But that's a good thing, since I liked Dungeon Siege

The fact that when you leave the town/city area where all the players can congregate ( the multi-player/massive part of the game) you immediately go to an instanced zone all to your self was actually kinda cool. It certainly does cut down on the player-to-player interaction that is the hallmark of EQ2 (which I also play), WoW, and other MMORPGs, but I don't mind that so much. Frankly, I hate some aspects of sharing the zone with others when it comes to kill-stealing, camping spawns, harvest botters, etc. - which exactly what GW gets rid of. It does sort of kill the idea of a "pickup group" but whether that is a high price to pay or not is up to you.
The lack of any kind of organized system for player-to-player trading or economics is a bit of a bother - its like the old EQ1 days where you stand in the middle of the square and shout what you have for sale, which sucks. There is no player-based crafting or tradeskill capability either, which will turn some people off. As you adventure you can find items that are used for crafting new items, modifying items, etc but the actual crafting of said item is done by an NPC - you pay them a commission to make somethig for you and provide the raw materials, out pops the item you wanted. This is great for me, since I never liked the tradeskilling aspect of EQ but I know there are some folks out there that really like that kind of thing.
The user interface so far is nice and clean. Of course I haven't memorized all the keyboard equivalents yet but if you get the collectors edition there is a handy reference card
The graphics vary widely depending on how current and powerful your system is - the more tricked out your rig, the better things will look. I have the good fortune to have a pretty good setup (see sig), and with all the graphics turned up to max, it looks gorgeous. Personally I like the graphics in GW better than I do in EQ2 and I thought the graphics in EQ2 rocked. Obviously the more you crank the graphics options up, the more you will sacrifice in framerate, but so far it hasn't been a problem for me.
There's plenty I don't know about the game yet, particularly when it comes to the skills/spells you get as part of your class. It appears there is only one "hotbar" for putting these things and you can only change the hotbar if you're in a city/town - if you're out in the world and want to use a different skill that isn't on your hotbar all of a sudden, you're screwed.
So far, I like it alot. It suits my personal playing style more than EQ2 does but it remains to be seen. I'll play it most of this weekend to get a better impression before I decide. I really do like the fact that I don't pay a subscription fee for this one tho. I have two EQ2 accounts and if it turns out I like GW better, Sony will be losing my money
R
P.S. - Just so you know, I've never played Diablo, Starcraft, or Warcraft, so I can't compare those
