For rentals:
Sony > Microsoft > Nintendo.
For games I will keep:
Microsoft = Nintendo > Sony
I just find the types of games Sony releases are interesting to play once and experience but I find the idea of playing them more than once not to my taste.
Microsoft tends to produce games which have local coop, more solid gameplay even if less spectacular so I find they can be replayed more easily and Nintendo are the same. The value I find in the Nintendo/Microsoft games exceed that of Sony games even though I play my PS3 more than my Xbox 360 I still own more Xbox 360 titles.
I am a PC gamer first and foremost and I shouldn't forget that whilst I play many games on consoles like a buffet I tend to buy to own on the PC. My HD 5870 means I can be extremely critical of the graphics of a title and often I come into the Sony titles with a critical mindset due to the graphical hype they often recieve so I then tear them apart mentally and any good work they may have done passes over my head.
Tease.
