I cannot answer that question, I mean, I like each game for different reasons. For example, one of my favorite games ever is Thief the Dark Project, love it because it is still the best first person stealth game ever made, it has great steampunk elements in it and the story is extremely thrilling. Baldur's Gate II, another one of my favorites is a totally different game which I like for completely different reasons like its very tactical combat, the spell system, the beautiful art style, the fleshed out characters etc. I think there is only one thing that is important for me no matter what kind of game it is, and thats immersion. Immersion includes a believable solid plot, consistent world + rules, believable characters and a certain amount of player freedom. Ok, my top ten are: 1. Thief the Dark Project 2. Baldur's Gate II 3. Thief: The Metal Age 4. Mass Effect 3 5. Unreal Tournament 6. Icewind Dale II 7. Icewind Dale I 8. Dragon Age Origins 9 F.E.A.R 10. Return to Castle Wolfenstein