I don't mind a road tax. I prefer it over tolls. We already pay gas taxes for infrastructure. My issue is that it is a set price. I honestly think it should be based on the price and weight of your vehicle, and your annual mileage. A subcompact for your daily 20 minute commute is less damaging to the road than a truck traveling 70k miles per year is.
My other problem, no guarantees that it will be used for infrastructure.