My favorite MMO that I have enjoyed well over 5 years is Lineage 2. If you want to give it a try, download the Lineage 2 Gracia Epilogue client after the break.
Lineage 2 is despite its age (7 years since Korean launch) one of the most popular games out there. The latest updated to the Lineage 2 game Freya has much to offer for new players. Although many – including me – regret that a lot of developers of Lineage 2 dropped out to develop TERA the game is still not dead (games said to be dead live longer I guess).
Download Gracia Epilogue Game Client
You can download the Gracia Epilogue client over from Gamershell. The client is nearly 5GB large, but they have some decent servers so it should be pretty fast.
A game account is about 20 bucks and the monthly subscription fee for 60 days is only $22 if you get a game time card via Amazon.