There's already a giant ME3 thread.
Not sure how the US laws are structured in this regard, but you could argue with some merit that based on comments by Bioware and EA before release that there is a valid claim for false advertising. Down here at least though I don't think it would hold much legal water as the law is structured primarily to deal with consumers and retailers. There's no false advertising on the retailer's part, unless they were pushing lots of EA's PR material. I think you could end up getting a refund under Oz law, but that's about it.