OOOO. I wanna jump in! Two days ago I went on PSN and bought Ratchet and Clank: Quest for Booty. I think it was roughly about a two gig download. Started the process. Five hours later(took my daily constitutional) came back and it was at a paltry 23% complete. I quit the download. So last night I stop by sister's house and my brother-in-law is in the process of downloading the game, literally at a blur! Now I don't know jack about the subtle science of internet connections and the lot. But, I DO know that we have different services, his being the "better" or at least the more known service carrier of the two. So maybe it does make a difference. As far as the Achievements/Gamerscore bit. Like Gunter2 said, your latest update should have added the 'Trophies' attribute to your PS3. Heralded as the response to the Achievement/Gamerscore on the 360. I dont really mind the updates. I enjoy the fact that the PS3 remains current by giving me the free upgrades. Who am I to complain about something that's free? You can buy skins for the PS3 too. I mean they cost an arm and a leg, but hey, if I want my PS3 canary yellow, I better have the loot. By comparison, I find that on my 360 I have to pay for EVERYTHING! The PS3 has quite a bit more freebies as well as an overall free service to game online. Guess I'm a cheap bastard...
All that to say, I had the slow download issue that you had. It sucked. But at this point, both systems are coming so close to being identical with their networks and availible wickets & doo-dads, it really has come down to just bouncing back and forth between systems whenever a new game or 'exclusive' drops. I do however believe that in the long run, with the continual upgrades, the PS3 will outshine the 360. I think SCEA called it a "10 year plan". Until that day though, I will love my systems equally, because they have both given me so much joy!