Just posting to agree with everyone else that you should play the entire MGS series ASAP. I'm not as big a fan of it as some people here are but it's still pretty good.
When you get around to Assassin's Creed keep in mind that the first game, while good, is very flawed and those flaws are all fixed in AC2. It's my second favorite series this gen, though, and you'll probably enjoy it.
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Gamertag/PSN-Murphiroth
"Would have liked to run tests on the seashells..."