RFUS
Anustart
Whoever mentioned Neverwinter Nights, excellent shout, even now one of the best RPG's out there. Superb story.
I don't get Assassins Creed, just freeplay Prince of Persia for me.
I can't speak for everyone, but I love AC for 3 seasons:
1.) The cryptic, unravelling story.
2.) The tight, parkour-esque movement.
but mostly:
3.) The scenery. They painstakingly recreate exquisite, historical cities in each game, and it's just gorgeous to behold and experience.
The general consensus with Prince of Persia is that the best games are from ages ago. Graphics and gameplay have evolved a lot since then, and Creed perhaps is similar to PoP, but 10x better than the current crop of PoP games.