Drivers get alerts as soon as they receive badges, and their collection is accessible a dedicated page -- it's like Swarm for ridesharing workers.

Compliments could help drivers by motivating them to go the extra mile, and indirectly showing where they could improve. You might get better service as a result. With that said, the absence of a Lyft-style tip mechanism isn't helping -- we suspect drivers would like some extra income to go along with those kind words.