a very very large majority of the "car audio people" are a comical, unscientific, un-technical lot. i dont AT-garage, but the kids in the Applebees parking lot on a friday night with his trunk open comparing systems against the neighborhood homies.
what, to them, is good is something that 1) they have 2) their friends have 3) friends have said are good 4) (and nowadays) internet message board says are good. what's good is any subwoofer they can blindly crank up but doesnt break. whats shitty is an equipment they hooked up incorrectly and happen to blow up. they'll compare RMS wattage, SNR, Impedance, and Voltages all day, but wouldnt pass a 10th grade physics test -- they dont know what those terms actually are.
With that said, the car environment is very audio unfriendly. Between the cabin shape, volume, materials, sources of interference, tremendous road and engine noise, it doesnt reason to seek out something that produces objectively the most accurate fidelity output.
When I had a Clarion, it looked good, it was intuitive to use, it had lots of features for the price, and it DOESNT sound bad. So I liked it lots...until it got stolen. After that I brought a CD-R to multiple stores to test multiple cd players. Consistently, Alpines had the fewest problems reading the disks. Since 98% of my stuff is burnt, it was an easy choice to go Alpine. Then with my last purchase, at the time, Alpine had the best "full" iPod integration, and it blended extremely well with my interior. However, this new generation of Alpine have terrible user controls, so I likely will go with Pioneer next