So, I love the tool and never take a trip without it, so Thank You!
On our most recent road trip, my daughter asked me why Waze couldn’t tell us which potty’s were nice and whichones were’nt.
Is a bathroom rate feature in the works?
Please submit your idea to http://waze.uservoice.com
I think at this time there are no plans about rating toilets 
Already an app for that. Called sit or squat.
SitOrSquat is for local restrooms, requires a facebook id, and an iPhone (even worse :-)), and I’ve never seen a satisfied user. I think building a restroom finder (with reviews) into an app that already knows gas stations, and already knows the route you’re taking so it won’t tell you about supermarkets in between exits that are 10 miles apart, is a great idea.
MOD EDIT: Old thread (2012) locked, please post in the more recent one: https://www.waze.com/forum/viewtopic.php?f=3&t=171822 (2015)