A good game with no glaring problems, but considering how much it's been talked up, I'm a little disappointed.
Although the game is technologically sound, with very few bugs or mechanics problems, it's brought down by lots of little things that just eat away at the experience. The world of Rift looks great if nothing is moving, but start to run around and the character motions look rigid, poorly animated, and unnatural. You can track quests on the side of your UI, but there is no easy way to hide them like a dropdown menu. They're always there cluttering up your view. If you use many custom keybindings, you'll be disappointed to find that there are certain keys for which the bindings cannot be changed. There is no instance queuing system of any kind, leaving you to spam LFG messages if you want to do a dungeon. Many of the menus are extremely basic to the point of being slightly difficult to use. The auction house menu is lacking several functions that I would have expected from a brand new game, such as the ability to create an auction based on price per item, not just price per stack. And although the Rifts are cool, there are just too many. Their novelty wears off fast and you quickly find yourself not caring whether they get closed or overrun a town.
If you've been suffering from boredom with your current MMO, then rift is a decent distraction. If you're looking for a complete, refined game that you can really get into for a long time, I think there are better choices out there.