It means you need to start listening to music with a measurable level of intellectual content. AKA not Mike Jones or any other mindless rap, pop, or whatever "music" people are listening to these days.
To all you haters who say "what's with rap these days?" Don't you realize that all the good rap isn't found on the radio or on TV? The good rap coming out these days is found in the underground. Theres tons of great rap that's been made lately, you just won't hear it unless you are looking for it. Try.
Yeah, seriously, Slayer can't keep time or anything. They're total noobs when it comes to playing their instruments, they should learn from the guys that talk along to computer generated music. They need to get with the times and learn that playing an insturment and writing incredible lyrics isn't appealing to kids who sag their XXL pants.