Change is hard but I like Kiefer Sutherland, I think he's going to do a great job. You can always keep faith with the rumor that the only reason they got a different voice actor for Big Boss is because they needed to distinguish him from Solid Snake, who takes over halfway through the game as the main protagonist, voiced by David Hayter ("kept you waiting, huh?") Basically the MGS2 Raiden switch but in reverse.

I've said all I had to say when the game came out a year ago, I'll just reiterate - if you only play the main story, no, it's not worth it. But the other side missions and everything in total on the disc gave me more hours of playtime than many $60 games did. Gameplay, technology, and story-wise it's better than most of them as well.