In fairness, the PS3 owners have this exact same complaint because their hardware is superior to the xbox yet most developers design for the xbox because the coding platform is easier and, as I understand it, much cheaper. So basically all the small companies will learn the xbox and that feeds the cycle.
Also in general ports from Xbox to PS3 look terrible and actually end up looking much worse on ps3 than they do on xbox, the inferior machine.
In summation: PS3 fanboys get trolled hard.