Cons: I was overcharged and didn't realize it at the time. I reserved the car through CarRentals.com at a rate of $37/day. The salesman at the counter told me I could upgrade for $12/day and I agreed. I was charged $30/day more -- $67. When I turned in the car, they said they would email a receipt to me because their computers were down. I never received the receipt by email but my credit card was charged for the higher $67/day rate. I felt like the salesman was trying to upsell me. I will probably not use Avis again.
Cons: The rental car company's name was not on the shuttle bus at the airport. I waited about 20 minutes, tried calling several times (no answer) so I finally had to take a Lyft for $12 to get there before they closed. I asked if their shuttle had stopped running and she told me no. Well, I never saw one... "Oh they say Love Connection on them." That is not the name of the company so how on earth would I ever know to get on that shuttle? They certainly never told me that.
Yes, some rental companies accept debit cards for reservations, though they may ask for additional identification and proof of insurance when you book. Even if you can pay with a debit card, some car rental locations require a credit card for the deposit. Be sure to check the terms and conditions. If you don't own a credit card, you may not be permitted to rent a car. Cash, prepaid cards, and gift cards are never accepted for reservations.