I love realism, but I don't buy games for the sole reason of it being realistic.
I'm afraid GTAIV will get boring after a while because of its realism, and how you can't get away with much without the police being all over your ass.
I'm still finding ways of having fun in the first Saint's Row, because of how it is not realistic, and what you can do because of this.
My dad doesn't believe in renting.
Separate points will be in bold, in order of appearance.
1. You can always cheat, if you don't mind missing out on 2 or 3 achievements (XBOX) or "trophies" (PS3 if they actually have any for the game)
2. I guess you can always read some reviews, too.. or get a friend to rent the game?
That reminds me. XBOX or PS3? (Which one do you have/plan to buy the game for)