people have experiences with all different brands of car audio and its hard to compare them all unless you're using the same setups, same car, same wiring/install.
my mate has a setup with all sony speakers and a single 12" all running off a fusion amp(which i also stay clear of because they are ugly). its $$% loud and very very clear, even moreso than my setup.
ive had a pair of 150rms single coil subs (one jbl and one alpine) running off a small cheap rockford mono channel amp. the setup sounded average but it had enough deep clear bass to kill a small child. yet after all my gear got stolen i could never get back that same bass running 2 of those alpines off a $1000 kenwood amp.
moral of the story - sonys probably not as bad as its made out to be.
personally i would stick with pioneer for headunits and rockford gear for amps/speakers/subs...because its brutal and sexy.