Any moron can buy a pair of subs and an amp, then throw in a rap CD and be "king of bass". (Hell, my 4 year old daughter could "design" a system like that). It takes a whole lot more thought, planning, and install skills to create a well rounded system.
When kids come into parking lots bumping their rap, personally, I'm very unimpressed; and I'm sure the only person that's impressed, is themselves. Every once in a blue moon, there'll be someone who pulls into the parking lot listening to rock (1st sign that they're not trying to impress others), and you can hear everything (vocals, guitar, ect) along with the bass drums and bass guitar. The greatest thing of those systems are that they bump just as hard as the kids listing to rap, who are trying to impress and show off.
I swear, building great sounding, well rounded car stereos is becoming a lost art.