I loved the singleplayer. The way how natural it feels to be able to manipulate objects in realistic environments is a testament how revolutionary the game is. In other words: the gravity gun ROCKS!!!
I have actually... They kinda went psycho at me about the "new" PSP. My friend came over from his job like last week and showed me his.
PSP is nothing impressive to me... you have to buy new disks for DVDs to watch them. And it runs about 5 hours with games... less if you try running movies.