Talk me into playing Rift.
(This is Obsideon).
Well first, I'm here. <3
Second, very active warfronts (scenarios), which you can use to level exclusively. Although it isn't quite as fast as farming dungeons, it yields decent gear and is uber fun. Currently there are four warfronts. You get a new one added to the rotation every 10 levels. They all have different objectives. In order from lowest to highest you have (i) flag-based king of the hill, (ii) territories, (iii) capture the flag, and (iv) NPC assassination. They are all good times. :D
Third, lots of world PVP, although there is no RvR (well, no forts yet atm). D: Nonetheless, the world has a very active PvP environment, ripe for ganking and large scale PVP.
Fourth, the class system is freaking amazing. There aren't dual classes per se. You basically mix and match your class however you want. It's freaking amazing. So, you get this class for CC, that class for fire dps, and that class for off heals to create a huge dps class with splash healing and the ability for basic CC. It's amazing and any game after rift will seem bland if they use the standard class system.
Fifth, great graphics. They are realistic, not "kiddie" like Aion. It also isn't over the top like Aion with regards to gear. Very basic gear.
Sixth, rifts are basically PQs (albeit simple ones) from Warhammer.
Seventh, if you are a human male, when you dance, you look like Carlton from the Fresh Prince of Bel Air. (Carlton: http://www.youtube.com/watch?v=jKlxjbhB9HE;
Rift Human@10s: http://www.youtube.com/watch?v=Gi4AWgf_Bog)
8th, the world is pretty **** big, and the whole thing is PvP friendly.
9th, lots of dungeons.
10th, I'm here (worth noting twice).
11th, sorcs can stack their AoEs like old school pit of shades pwnage from warhammer!
12th, lots of character customization of the face (can't do much to the bodies).
13th, lots of hidden quests and easter eggs for fun that actually give cool gear to do them.
14th, collections like in EQ2.
15th, a well played sorc is OP. (mwahahaha)
... so, ready to buy it yet? <3