Board Thread:General Discussion/@comment-7218168-20140902024919/@comment-3060460-20140905004245

Paranoid Donkey wrote: As someone who played 3, Peace Walker, 2, 1, 4 (I know, I know, sorry), I completely agree that you should play them in release order. Everything will make more sense to you.

If, after that, you want to play them chronologically, I'd definitely advise that too. Why would you be sorry about playing 4?