The bottomline is the PS3 will never have the opportunity to be better than the 360 if developers continue to develop for the 360 first. The best scenerio out of a port is equality. And in most cases there are little hickups that give hints to one being the lead platform. Whether that be a blurry image (that you can only tell by viewing both versions of the game), bad framerates, or poor texture/lighting. Oblivion and GRAW 2 are the only exception, but they spent a lot of extra time on both of those.
I sure hope this changes and more developers follow Infinity Ward by having separate teams and splitting the load. The PS3 may have more potential but we as gamers may never see it from certain developers. The two producers/developers I see this being an issue with are Ubisoft and EA. That is why for now, I choose to buy games from these two producers/developers for my 360.
Games have definitely improved over the past year for PS3. In my opinon the PS3 has done better than the 360 did its first year, but games will only be as good as they are made. And it just so happens two of the biggest names out there care more about 360 owners. This is obviously due to install base, but how is the install base supposed to improve for the PS3 if these key companies don't get their act together. Its a vicious circle. Our only hope is for Sony to support and "instruct" the developers and hopefully they'll get it eventually. I still have high hopes for my PS3. I honestly prefer the controller and just plain like the machine more than my loud white beast.