Umm there are many variables which contribute to sound quality. Which are
Head unit
Speakers
Amplifiers
RCA's
Speaker wires
And above all this proper tuning.
This flagship unit is being used in all international SQ installs and even widely used in pakistan , you are the first person to say you are not satisfied by Pioneer headunit.
Maybe you did not like the sound signature of alpine components or there is a tuning issue. Or maybe your amp is not good enough or maybe you are expecting more than your system can actually perform.
So too many variables.
Find out whats bothering you.
Or go for Pioneer deh 80prs / pioneer p99rs , those are audiophile grade units