Typically, racers like the unpadded gloves simply because they are using them for hand protection in case of a crash. Not for comfort. Generally, if the bike is set up properly, the rider might like a less padded glove, as was already stated, you can feel the bars better.

I've ridden the gloves that are heavily padded, simply so I could feel them. I felt like I was handling a telephone pole, but I've typically used really thin tape and gloves with the least amount of padding I could get my hands on.

This does not always work for all riders. Also, in summer the padded gloves retain sweat. Ick.

Usually I will recommend bar tape that has padding, instead.