I voted as well. Were a couple of good ones, a couple of bad ones. Is all logical. It's hard to make these mashups I've found. About 1/10 is actually decent so we probably made hundreds to come to this selection.
i made about 15 in my quest, and started to lose it by the time i got to the one i selected. They don't mash up perfectly with how the app works but it's all fun.
Yeah there's a sort of 'trick' in that if you take a rather monotonous EDM track (of the kind that just uses one or two chords) and mix it with a pop banger you tend to get fairly strong stuff. Beyond that the only thing that produces consistent results is a lot of time and a lot of effort.