What I was going to write got deleted. Fail.
But I am sure someone else will come up with the same answer I was going to write, hopefully. Many of the things you wrote are either half-correct or completely wrong, for eg. Online performance. Watch the video I posted, if you have online problems its probably because you are using wireless or because you are using a fail internet. I had better results with PSN then XBL.
Patches? Patches in my opinion is the biggest strength of PSN, if you look at games like MAG and Heavy Rain(has a 1 GB move patch) they have incredible amounts of patches but they are very useful which is
wait for it.......
impossible on XBL. Yeah, so you can just put in your disc and ignore your PS3 for some time(I however agree with MGS4, it doesn't use the PSN architecture for patching, and even I have never played an online MGS game for the same reason).
There are additional benefits to PSN because its open, we are getting a version of Portal 2 that's much closer to PC. We have free PSN themes. We can make custom themes ourselves for free. We have dynamic themes that look a lot better than the best themes on XBL. We can't make them, BUT the best part is PS plus users get many of these goodies along with avatars for free. And its theirs forever. Not a rental
There's less options, yes, but the choices have improved greatly and its much cheaper on PS plus then XBL. There's a 38 MvC avatar bundle coming up for PS plus for $3 or $4, can't remember.
There are many advantages of using a PSN, people just don't know it. Yes, I said it! True skill? Killzone 2 has it, Demon's Souls has it so its not exactly exclusive to XBL, and nevermind the fact that it doesn't work properly on the 360 since Gears of war 1 was supposed to have it but it never used it in my case, I always got matched up with the top dogs.