I've made this a couple of times and it has always turned out well. It isn't my favorite, but it fills a craving for two different groups with the brownie and the cheesecake. I've even made it in 2 8X8's and I've frozen one after. I had to cut my cook time slightly, but I just had to pay attention.
Follow the directions and don't over cook it and you won't be disappointed. If your oven temperature may be off, get a thermometer and it will be just fine. Most bad reviews I've seen have been from people who have overcooked it and that is the error of the cook, not the recipe.