I don't get why there are good games that don't need to be installed while there are other games, that needs to be installed.
And PLEASE do not spin things. A forced installment WITHOUT a significant effect on the game is not a good thing. Loading times of GTA IV were more or less the same like on the 360 without a HDD. Same for DMC, Bourne or Bioshock (what we have heard so far, it will be more or less exactly the same game, check video-comparison)
For me, this ruins the whole BluRay-argument. Why do I need Blu, when I have to install the game for more than 10 minutes anyway? Ironically the game would look exactly the same on a DVD, without the installment.
Imagine FF XIII coming out on 360 on 6 discs or something and people going crazy: "PS3 is superior!!! It fit on one single disc! I don't need to change a disc!!!11... Wait... got to install for 15 minutes..."
So in a word: This won't become a problem for the PS3 saleswise, but as a console-gamer, I just don't like the idea of forced installs. I mean 10 years ago, we had Plug n Play on the N64 without ANY loadings. Now we need to install for up to 20 minutes (DMC!) before the game actually starts. That is not an improvement IMO.