The problem with PS Plus is 90% of the games they offer I already own. And if it's something new like this, I'm not paying $50 a year for a one month window to rent it. If i just bought a PS3, $50 a year to rent games isn't bad (because you lose them if you stop the service, you are renting them) and the discounts are nice. The Avatars (Icons), themes, PS1 games I could do without. I grew up in PC land where all that stuff is free.
Really for a long time PS3 user that's already bought a lot of games, PS plus is just about useless.
At the same time, I pay $30 to $40 for Xbox Live, only because I have to. If I could play online for free, I probably wouldn't pay for it.
PC's and Steam (and similar services) for the win.