Play the first one before you go on with the second. I think this is the best RPG game so far.
Others include: Fallout 3, Oblivion, Dragon Age: Origins, Alpha Protocol (Average game, but playable for RPG lovers) and The Witcher - Enhanced Edition.
well...i think the reason y nobody's mentioned Mass Effect is because its not a pure RPG..its sort of a hybrid between TPS/RPG. DAO is a good candidate.
The Last Remnant
Neverwinter Nights 2 + Expansions
Ghotic 2 and 3
Daggerfall <- This game is Free now btw
System Shock 2
Icewind Dale 1 and 2
Diablo 1 and 2
Vampire The Masquerade: Bloodlines
These are some that haven't been named, I hope you have enough games now to kill your time.
Fallout 3 has been mentioned
From shianova's list I highly recommend Gothic 3 and Diablo 2.
also torchlight is good
[Edited by darkone112, 7/15/2010 6:27:57 AM]