I'm not saying they cannot be upset, they can be as upset as they want, but they should be upset at the right people.
Well, I think they are upset at the developers of the game, too, but they're considering taking legal action, which would have to be aimed at the publishers - Sony. In my opinion it's quite obvious from the statements in the article that they haven't seen the real game. Or even considered looking at the box for that matter.
I'd be surprised if they haven't at least seen video footage of the game, TBH.