I love the Metal Gear overarching plot, I've been a fan since the 8-bit games. Seeing it all come to the finale in MGS4 and those loose ends tie up was gratifying and made me think about it on a whole other level.
Kojima's tendency for long cut-scenes and heavy exposition is a subjective topic. I see a lot of hate-filled opinions in these replies trying to be conveyed as fact.
Obviously with Metal Gear, especially MGS4, if you played the game on the easiest difficulty, you're going to see more cut-scenes than gameplay. It's pretty much a reason to just see the story. If you want equal time between the two, play it on the default or hardest difficulty. That goes for ANY title in the Solid series and if you just plain suck at the game, then you have no right to complain.
If Kojima can lend a special quality to the rebirth of Castlevania then I'm all for it, whether the story becomes bloated or not. I like deep and intricate stories and if several long cut scenes are needed to convey plot elements then, so be it. If the controls and game mechanics are sound then it's all gravy, a wonderful melding of elements to make a possible huge hit of a game.
Would you prefer another 3D train wreck like Castlevania 64?