well i have games such as Syndicate, Bloodwych, Rainbow Islands, Sim City, Moonstone, Legend... (i could go on for a long time here) running at 50fps on pspuae, with sound. some need a bit of skip, but that is far from making them unplayable.
i play all of these and they do not suffer from un-playabilty. the sound isnt perfect i admit, but not terrible to the point of un-bareable when at 50fps.
sorry IC - i just happen to quite strongly disagree with what you've said - i guess well have to leave it at that.