Not that I ever support the double standards of the legal system, but in this case if Sony did advertise certain features that ultimately didn't work, then there is a case there. The problem is that, especially in the gaming industry, publishers tread on the 'false advertising' line very, very often. The line is quite blurred as it is.
To be honest, at one point I did feel that I should get some of my money back from Driveclub for the features that, to this day, simply do not work - I have never been able to get into multiplayer. But I love the parts of the game I can access anyway so my personal stance is to simply suck it up. Then they said I could have whatever DLC they just released for free - haven't tried it yet - so at least they're making an effort.