I'm going to buy a PS3 within a week and I'm planning to buy LBP and MGS4 the problem is that I've never played a MGS game before therefore I won't understand the story. The question is, is it enough to watch GT Metal Gear Retrospective and I could still understand the story or should I have to Play through the previous MGS games ?
Should I buy it ?
I would highly recommend playing through the other MGS games, not just to catch up on the story, but because they're three brilliant games that you shouldn't miss out on. If that isn't an option for you to do, then I would still recommend MGS4 to you, but the experience won't be as half as good as it would be if you play through the previous games.
watching just the retrospects won't help you completely understand it. It's best to watch that retro, read all you can find online, and also you can download the MGS database on the PS3 for free which has pretty much everything you need to know from weapons to characters to past events that are a part of the MGS universe but werent in any of the games.
This edit will also create new pages on Giant Bomb for:Beware, you are proposing to add brand new pages to the wiki along with your edits. Make sure this is what you intended. This will likely increase the time it takes for your changes to go live.