(a) pricing is not transparent what so ever. I can get estimated price but I cannot get the total out of the door price. It makes zero sense in 2018.
(b) i can never get a car that I am "ordering". I fail to understand why a Zipcar can do it, but neither Hertz nor Enterprise nor Budget can. If I'm getting an Tahoe, which is expensive which you claimed you have, I'm baffled why the barely coherent employee thinks that a minivan is a "similar vehicle".
(c) daily insurance scams - luckily it does not apply to me because $25/trip premium insurance via Amex is easy, automated and just pure awesome but oh my god people who do not know about it are just getting screwed.
(d) And finally... why is it that I still cannot search all the locations within a certain area for the cars and prices that I need? Why do I have to repeat the searches for the twenty Hertz in NYC when with a Zipcar or Maven i can just scroll through the map or get a list?
If rental car companies were to fix this 99% people like me won't be likely to use "peer-to-peer" because there's nothing worse than driving someone's non-standard, modified, coolant-gauge-may-not-actually-work car.