The review said the music doesn't fit the campaign as well as previous Halos. Someone said he's listened to the music, and he agrees that it probably won't fit well based on past Halo experiences. That's a totally valid stance to take.
:/
It seems like Forbes had the angle ready to write, took it to Franklin, and he stumbled though "Well, Slayer is a competitive gametype we have, and, uh, we also made CTF simpler... plus Grifball? Stay tuned!"
There are over 100 active teams right now and we got a chance towork with GrifballHub.com very closely on a reimagination of the Grifball mode, as we’ve created it as a real thing for Halo 4. It’s like its own mode. It’s got its own customization option so that the teams can very carefully control their tournaments.
:/