Let's all discuss MMORPGs, and what you like about them and what you hate about them. Also you can list what MMOs you're currently playing.
For me, one thing I love about MMOs is the convenience of game play. I just love the fact that MMOs are there at any time to give you enjoyment for a long time.
One thing I don't like about MMOs is the player base (of a particular game) can be a bit set-in-their-ways, and not willing to accept change. I feel that change could be a benefit to a game.
Currently, there are four MMOs that I am currently playing, Star Trek Online, DC Universe Online, Aion Online, and then Soul of the Ultimate Nation (these four are my personal favorites with STO and DCUO being tops).
There are a couple more MMOs that I am excited to start playing (whenever they get released or even start Beta testing), and they are Marvel Heroes (something similar to DCUO), and Otherland.
In case you were wondering, all the games that I have listed are Free-to-play, so if you don't have the money to play a game that is either Subscription based or buy-to-play, these games are, in my opinion, excellent alternatives to the Sub-based or buy-to-play games out there.