I played in the Rift beta (which means my info is old, I realize), but didn't choose to play after that. It was a very solid game with minimal bugs even in beta. The character progression system is good, and the game looks nice (if more than a little "generic swords-and-sorcery fantasy:). All-in-all, it is a very professional and well-executed game...that failed utterly to "grab" me in any meaningful way. I ended the beta with two reasonably well advanced characters that I could care less about.
That sort of engagement, however, is an utterly subjective thing, so I encourage people to take a look at the game. Objectively, it works well and is nicely polished...and what fails to grab me might work really well for someone else.