depends on what system its on
This year's actually supposed to be a really good year for PS3. A lot of good games coming out for it, plus Home is going online sometime soon.I honestly don't think it would be worth a PS3 in my opinion. I am not saying MGS4 is going to be a bad game, I'm saying that I don't see much other games on it just yet. I have this feeling it will be on the 360 one way or the other, so if it is, then I'll pick it up.
Just my two cents.