I find this game to be awsome, here's my opinion on the three games.
This game is a true survival, having to hunt , kill , and of course .. STEALTH
The graphics are good , but the controls for shooting are difficult and annoying, if you can see past the shooting problem then you will see a fun and interesting game, the story is very odd though.
MGS Peace Walker
My favorite of the HD Collection , this game has low quality graphics because it was originally on PSP , but the weapons and items are fun, not much to say but AWSOME
I can't give this a review since I haven't played it much .
If you ever played the originals and like them(You will love them), or never had a chance to play these classics. Give them a shot they all have good stories to them. Great stealth play, with action moments. You really have to think before you do alot of things in this series.
One warning to any new players to series it does have alot of videos going through the story some can last upto 10 minutes, nothing like metal gear 4 with the monkey scene. (Somewhere around 20 minutes.)