I bought a Prius in the fall of 2008. So far so good with the car.
Here are the facts with my 2009 Prius:
It does get 45-48 miles per gallon if you drive at a steady speed. I usually am in the 60 miles per hour range.
The longer the trip the more the mileage goes up... if you drive in a sane manner.
Doesn't like windy days, but what car does?
I do agree that the car is not quiet on rough roads.
Fuel economy does go down to around 39-40 miles per gallon when temp drops below freezing.
Hates ice and very low clearance on auto body.
I probably paid too much for car, as I purchased it when gas was $4 a gallon.
Warranty is 100,000 miles on batteries or I would not have bought the car.
The Prius is not a flashy car. That is not why I purchased it. There is plenty of room inside the car and it handles fine.
I have had two Camrys, one RAV4 and now the Prius in the last 15 yrs. Ran the first 3 cars all over 100,000 and traded them in on the next Toyota. About all I did to the cars were put tires on, change oil add a battery after several years and keep them waxed. I had one power window issue and one power antenna problem, and that was it on the first three Toyota's, and those were after at least 5 years of owning each car.
I kept my RAV4 for winter driving and drive my Prius on any nice days. Love my RAV4 but it does only get about 22 miles per gallon while the Prius is double that easily.
I will not buy another brand of car. Hope their quality continues. I would buy US if the makers could match the dependability of a Toyota.