Divine Divinity. It's a classic style RPG, such as the old SSI Darksun game, or Baldur's Gate, except you have 1 character. It's almost like Diablo in portions of the interface, except where Diablo Fails, Divine Divinity is a success.
One of the many reasons I enjoy this game include: Interactive quest lines. You can fail some quests, but it doesn't completely fail your objectives. One quest in particular was a little confusing to me, I failed, but apparently I am still able to reconcile my differences later down the road. So that's a nice change of pace.
Reputation system is enjoyable.
The class system isn't limited. Where you have AD&D class systems that are stagnant, i.e. you can only have certain skills, this class system allows you to make a fighter, then buy skills from wizard, or rogue to turn him into a Ranger, or a Paladin, or a Swashbuckler! It's very entertaining.
Drawback: as with baldur's gate, there's a lot of Monster killing to advance in level.
Bonus: Unlike Diablo, you don't have to save/reload while killing 1 specific monster during x time of day to get Weapon AWESOME z. Diablo freakin sucked in that area.
Fun story! But it takes a while to experience it, why? Because of the Monster killing required to level. This extends gameplay, which is good, but it also becomes unrealistic (spending 20 character days just to clear a freakin dungeon).
The Fighter is a bit weak, even with me plugging points into attack and defense, I use a lot of potions, a lot of food, and a lot of time resting just between battles. Also, on Hard mode, certain monsters are killing my fighter in one hit, monsters which are lower level than him. Not sure if this is a bug which has been fixed as I have not yet patched the game.
You can buy Divine Divinity for 8-10 bucks at your local Target store. It's got a picture of some angel reaching to the heavens with a blood soaked sword coming down.