I don't understand how you can sue a company for putting out an unfinished game... I'd think that you would have to prove malicious intent, otherwise you'd have no real legal grounds for a suit. It's like saying to a musician, I thought that "your music was pretty good, but the harmonies were underdeveloped and needed more work" and then suing them for pushing out an incomplete album. I'd agree if software fell under the same type of intellectual property laws as say a paperclip or a pencil, but they are in the same category as musical pieces or works of art. Those types of economic goods have looser restrictions and different sorts of regulatory requirements.
I can maybe see the suit going through IF they did in fact violate some of the SEC's securities regulations otherwise the suit stands on weak legs. yeah, it sucks that they put out incomplete products all the time, but who is stupider, the company for pushing out the products to make money or the consumers for buying the incomplete products? You get what you paid for and if you keep buying, they'll keep selling...simple economics.
(Edited for spelling...stupid keyboard needs replaced)