I also tested this game. As a Diner Dash junkie myself, I did enjoy this game.
I will be buying this game, when I actually get the time to do so. I don't think the diner dash phase will ever die out, as long as they keep coming out with new ways to mix it up.
This is awesome. I love the new people, and the hamburger grinder and the warmer. If you get enough happy customers then you can call cookie to help do the prep, like ground the hamburger, throw things on the grill, and order things from granny's station.
I haven't beat the game yet, but I love the new stuff that's been added from the original dash games. If not for the fact that they keep mixing it up, it could get really boring. I'm glad it hasn't though.