That was one of the things I didn't like about the PS3, it pretty much pushes you to install your games, which to my mind is silly, because I've always loved just sticking the disk in an playing.
Thankfully I am an XBox gamer and it's optional for me.
Quote: "If its already installed, i press a button and play, less of a hassle than handling with cd/dvds imo x)"
That's fair enough and I sometimes enjoy that luxury on the PC as well. The only problem I have with it is that these games take up HDD space and it can sometimes be a lot. I think to have all of my games installed would be a waste of Hard Drive space, so if, say, I thought, "I fancy playing Crysis as I've not played it for a while", chances are I would have uninstalled it and would have to wait for it to download again. For the CD version, I'd have to stick it in and install again (and use the disk to play anyway). For Crysis 2 (because I got it for 360) I can just grab it, stick it in an play.
Another advantage of console games is that I can trade them in. GAME no longer lets you trade in PC games, places that do will only accept anything that doesn't have DRM. I could trade in something like Spore and as far as I am aware there is no trading in system on Steam. I actually use GAME's trade in service quite frequently. Obviously this wouldn't be relevant to the Ouya console, because chance are, it'll use a webstore.
So I think there are disadvantages and advantages here and reasons for and reasons against. I tend to switch between PC and 360 anyway. PC tends to be where I play MMOs and Indie games, my console is where I tend to play AAA titles.