PS3 version seems like a waste of money to me. That, or I am spoiled by the Steam version. There's maybe 3-4 games up at a time on PSN. Weapon attachments are limited for whatever reason, you get lower exp it seems.
it sounds like one or both of your routers are blocking your traffic from communicating with each other I suggest opening up the ports on your router's to be able to communicate effectively. Here is the porch that you'll need direct Lee from PlayStation you'll have to talk to the robber manufacturer to find out how to open up the ports on your specific routers