Not that everybody hasn't said something relevant about this game - I just finished it (finally!) and I have to say that it's a good game with great graphics and attention to detail that's ultimately let down by a short game design and an overly complicated, too-smart-for-its-own-good story. I enjoyed it quite a bit - the core mechanics are a blast. But the gameplay just isn't as focused or as long as Metal Gear Solid PSX. Hell, the last battles are kind of a joke.
All this doesn't mean I won't finish it again :) I've already passed it two more times. But I have to admit to being a little let down by the story - and given that the story is a MAJOR part of what drives this game, that's pretty bad.