I know its not a console, but my PC actually remains my favourite platform - its actually kind of killing me weaning myself of it onto my PS3 for games like COD4. I think it would be obvious what's to like about PC gaming (graphics, mouse & keyboard for FPS, best online, etc.)
Next favourite would be my PS3.
What I like is the interface and the flexibility of the system. I'm really enjoying COD4 and UT3 (which I thought I'd hate on anything buy a PC) and while its graphics technically can't compete with my PC on a my HD TV they look awesome and games are much more immersive. I also get to relax in a nice leather couch with a beer when I play on my PS3 which also helps.
I also like some of the inventive PSN games like Everyday shooter and Flow (and I loved the chochrome demo).
Finally I use it for BR, DVDs, playing home movies (look, its the kids skiing in HD!), music and images - looking at a 7 megapixel picture in hi-res via the PS3 beats a 6 x 4 inch glossy anyday.
I also like the mix of games for my kids (from stuff like snakeball and Pixel Jucie Monsters on PSN to R&C) although I think too many games are skewing older on the console which is hurting its ability to sell like the PS2 did to the parents demographic - its really needs a lot more R&C games or games like Sly Cooper and Jak and Daxter. Still, LBP looks awesome and my kids can't wait to get a hold of that having watched the trailers, etc. released so far.
Try to be reasonable... its easier than you think...
