I think I like the binary choice. I also think it'd be better to flip it around. These services could ask if anything went wrong, e.g., "Did the driver do anyt

I think I like the binary choice. I also think it'd be better to flip it around. These services could ask if anything went wrong, e.g., "Did the driver do anything dangerous?" or "Was the driver discourteous?" Likewise for the rider. Since we're saying anything less than 5 stars is a problem, might as well ask explicitly problems, and if it's not big enough to be worth reporting, we just assume it was good enough.