Alright, I'll start. First you have to have a monster rig to run this game really smoothly, I'm on a 1gb RAM radeon 9800 XT 256mb, with a p4 3.2 ghz and I have to run the game on high performance to not experience much lag.
Heres the gameplay review. I haven't experienced some of the things they put a lot of work into such as the crafting system, from what I've done it looks promising, very detailed; as opposed to a lot of games crafting systems where you find the resources, hit craft, and wait for the little build bar to fill and you got the item, eq2 changed this some by adding "crafting abilities." For example, you might have a situation happen called "day dreaming" then you use the correct ability to counter that situation and also abilities have a secondary effect (ie, increases progress, but decreases durability). So you use these crafting abilties to get the most out of the item you're crafting.
Then combat, my favorite part of the game. They've added something called heroic oppertunities (call it a combo if you will) to the game. Where you use an ability that triggers the start of a heroic oppertunity then you follow it with another ability that blinks on your hotkey bar. Or you can start it and another person in your group can continue and eventually it ends and can do a number of things, from damage(usually is damage) to buffing you or debuffing the enemy.
Group maximum limit is 6 people. Six people isn't enough to do some of the more difficult quests. They added something called raid groups so you can have 5(?) groups come together to take down a very difficult task. You won't get much xp at all for normal kills and getting loot in raid groups is pretty much hopeless, but if there's a very hard enemy you need to kill for a quest then raidings the way to go. I experienced my first raid group today and it was a lot of fun.
One of the coolest features in everquest 2 though isn't even part of the game. Eq2players.com allows you to see your character's and others stats/kills/accomplishments/screenshots/biographies/etc (see my signature). There's also an item database on the site even though it costs extra/month you get a free month of use of it so I'm enjoying that while it lasts.
I'm not sure if you've ever played the original Everquest but for those who have all know death was a major pain in the ass. Luckily they made it much less harsh. When you die now you'll get an experience debt, when you kill rougly 50% of your xp goes to repaying the debt and 50 to your normal level gain. When you die, all your equipment's durability goes down by 10% but it's fairly cheap at early levels to repair. If you revive not by a player you go to wherever your location is that you chose to revive at and a trail leads you back to your body, where a soulshard is. If you collect this soul shard 75% of your experience debt goes away

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I'm afraid I'm a bit biased as I was looking forward to Eq2 a lot before it's release so I can't really think of any weaknesses other then the major speccs you need to run it. All around a good game in my experience thus far. Maybe I'll update this as I do more things and get higher levels.