I don't much care for pvp, just pve really, so I doubt I'd be much help to you. That being said, I do play Aion off and on, and enjoy the pve part of that game. But, since you are mostly forced to take part in pvp, it's not a long term project for me. I'll probably quit just after I hit the 6 month mark later this month. And I'll note again, i really do like the pve from Aion. It can be a bit grindy at times though.
Vanguard - this game was touted as a game for the hardcore when it came out. More like eq1 when it first game out. It looked great when it was new, but my aging system had trouble running it. It wasn't really a couplete game back then either. I liked alot of things about it, but ending up dropping it after a couple months, since the game experience (back then) just wasn't up to snuff. I've considered going back and trying it again. Perhaps I will after I quit Aion.
EQ2 - most of the people I was friends with in EQ1 went to EQ2. I played it for quite a bit when it was new. But, at that point, I was still pretty burned out pretty hard from EQ1, so I ended up quitting after level 40 or so. It's another I've considered trying again, but haven't.
Warhammer - I only made it to level 20 or so in this game. I'll note, this is probably the only game I actually enjoyed pvp, with the open pvp areas (never did try their instances). There was alot of things that Warhammer did that I liked quite a bit, like their large area quests that you can join just by being there. Unfortunately, I level pretty slow, so I soon had trouble finding people to do those types of quests with, as well as the pvp areas for my level.
Age of Conan - I really like the game when it was released, but I kept running out of content. Got up to level 36 as, erm, I can't even remember the name of my class now
. I quite, and then came back when they said they had more content. This time I got up to level 49 or so, and then ran out of content again. Perhaps there was more to do, and I just couldn't find it though.
A couple of free to play/cash shop games I'll play every now and then.
Sword of the New World - There are alot of things I like about this game. World setting, getting to control 3 characters at a time, the massive amount of characters you can quest to add to your party. This one is pretty typical of Korean mmo's, with one hell of a nasty grind though. Early on there was alot of problems with gold farmer bots when the game was new and still pay to play, but I every time I come back and play the game again, I don't see anything like that anymore. It's not a game I could play full time, but since it's free, and my account never goes away, I can play as much as I want and then put it away for a bit.
Atlantica Online - This one is very unusual out of all the games I've played, considering the game's combat is fully turn based. You start with 1 character, but then start adding more people to your party pretty quickly. Eventually, by level 50, you can have a full party of 9. Battles were instanced, and was completely turn based, you'd go, then the mobs would go, then back to your turn, etc etc. The game has something like 110-120 levels, so far I've reached 72 or so. Through 72, there was 0 grinding. Every bit of xp I've earned was from doing quests. I've heard after 100 you don't have many quests to do though, and the grind is nasty then. One of the minus' with the gamethough, is the quests can get very, very repetitive.
hrm, I just noticed after reading my own post, I sure say though alot. Perhaps I should work on that
edit - I'll add, there are 2 games I'm looking forwards to. One, Knights of the Old Republic online, has plenty of info out there to look for.
The other is Blade and Soul. It's nother ncsoft project, so I expect it will be another Korean grind. But, it looks awesome. Basically its like a hop and chop movie turned into a mmo. All the classes are martial arts based. Character designs are very Korean, but the game looks pretty from what I've seen.
And its got wall jumping!! just how cool is that
But, the only info I've seen for the game is the 15 minute video clip they have up on their main site (and thats all they had the last time I checked), so I really don't know much about the game.