Yes, because Niantic doesnt review stuff. Other players do. And whilst this system give acces to ALOT of potential reviewers, it also gives acces to dumb/lazy/hatefull people. Your bad nominations being rejected for the wrong reason is usually just a reviewer who cant find the right reason, or is lazy and just picks any reason.
Perfectly eligible nominations being rejected could also have a ton of reasons. Someone could give their own spin/understanding to the established rules. Someone might not be up to date to the new rules (Looking at trail markers). Someone might be an Ingress player who doesnt want another portal in an other teams territory. Someone might not be able to find the POI on streetview, cause wayfarer sometimes dumps you in the wrong street/photospere and not everyone puts alot of effort in searching the right spot.
Theres tons of reasons something good might not come trough, and something bad might. But your wayfarer rating on the wayfarer website is not one of those things.
A good submission is a good submission, regardless of all the garbage cans you might have submitted before that. You just have to hope your good submission lands at a good reviewer.
I did hear that if you get alot of rejections your new submissions might take longer to get reviewed. Not sure if true, but makes sense.