There's only so much you can do with realistic so I have to go with unrealistic.  If I pick unrealistic I can make a realistic game and add one unrealistic thing so I can play a realistic game that isn't, yeh, that makes sense.  I could make a super realistic FPS with realistic damage and gunfire and the like then leave the sun out of any daytime levels, thus making it realistic but labeled unrealistic.  It's an easy answer if you think about. 

unrealism, because I can't pull off the likes of a Screwattack, double jump or wolf transformation in real life.

Surrealism for sure. The creator(s) can create a whole new fantasy world that breaks real world logic, such as the Super Mario world.

I play video games to get away from reality, not to get into another reality.

Same for me. Consequently, I have never understood the love for modern, realistic FPS games like the recent iterations in the Call of Duty series.

Not to lie, I have 2 ingame days played in Modern Warfare 2 which is quite a bit of time. That being said, I have not played since March 2010 and wonder why players love FPS games?

When you say realistic Vs. unrealistic, what I hear is abstract Vs. concrete.

I don't want my games to be too abstract otherwise I more often find it hard to "get into it." And I don't want them to be too concrete otherwise I often find there to be nothing new or exciting left to the creative imagination - that's me, the player.

So my answer is sort of a non-answer.  I just want a good middle ground.

*For the record I consider Pacman to be abstract/unrealistic, given the abstract environments, the cartoon characters, and winning by rallying up points.  Call of Duty is concrete/realistic because of the real-life environments, real soldiers, and you win by tallying up deaths and mission objective which are not abstract.

Unrealism; if I wanted realism I'd just go walk outside and hang out in the snow.

It's hard gauging how people feel about the terms "realism" and "unrealism."  I think everyone would have a different opinion about whether Mario was abstract or concrete.  Clearly it borrows from both realistic elements (humans, castles, grassy environments, princess, etc...) and unreal ones (cartoony, dragon pet yoshi, jumping really high).

If you think Mario is abstract then what would your answer for Pong be?  Super abstract?

Realism.

I'll take unrealistic games everytime. I think realism is good only for FPSs and even for those you gotta have a bit of unrealism like your character healing from bullet wounds in 30 seconds.

*Unrealism and its a big reason why I will in almost every situation pick Japan games over Western