Your arguments are more muddy than RE5's textures on the PS3.
Basically in all the points you keep hammering on the "best version of multiplayer games" nail, but really that has no impact on your average customer and really not even on me, unless the difference is glaring.
RE5 comes out, it is reviewed on all the magazines and the websites in both the 360 and PS3 version. It is given its rating, screenshots and videos are shown. In the reviews there is no such thing as "we give 84% to the PS3 version and 86% to the 360 because of the shadows and quincunx AA". It looks good, it is given a 9.5 in graphics - that's the amount of detail the average reader needs.
Later on someone makes a side to side comparison to spot the differences. Graphic obsessive, geeks and fanboys are the target for this comparison. I read it, you read it. A great clamour is made over details that are negligible if you just try for yourself and play the game on its own, with no other version on the side. Egos are stroked, feathers are ruffled.
Meanwhile most people will have bought RE5 or chosen a console for all different reasons.
Marketing sells. Media mindshare sells. A lower price tag sells. The exclusives sell. The headstart the 360 had and its more active online community sell, because one could want to play multiplayers game with his/her friends.
I was clear enough to say when I was taking my personal case as an example for a certain demographic. Maybe you should do the same instead of generalizing your nitpicking to quality and quality to sales.
PS
On the PC/PS3 hardware issue: and why do you think that you need higher specced PCs? Is there a magic dust that makes console hardware more performant? Or it might be the case that those PC games are coded with scarce optimization, basically relying on the fact that hardware is wildly variable but can be upgraded.
Same is with multiplatform engines and the consoles. Poor optimization versus a given platfrom will make the hardware choke, exactly as even PCs that are much more powerful in brute terms than a 360, chocked on GTAIV. As long as a multiplatform has not the same technical proficiency as the best exclusive games, it means that there's still room for optimization.
And let's face it, games like Uncharted and KZ2 proved that multiplatform engines have a long way to catch up on the PS3.
