I haven't played BD but I've listened to the soundtrack extensively for almost a whole year now. It's so good and is bound to be one of the best things about the game.
I haven't played the game so I'm not in the position to say this, but BD2 would probably feel really different without Revo's music. Getting Revo to do a video game OST was such a brilliant idea. It was a risk, for sure, but it was just genius. BD's OST is stellar as a result.
If I were stuck on an island with Super Mario Galaxy 2 and Modern Warfare 2, I would play Super Mario Galaxy 2 first. People who agree: 240