Weary purchaser

[Yaris17]

Ok all, before you read this ... Disclaimer: yes I will have a mechanic look the car over before any decisions are made!
I saw a 2009 Toyota yaris (red sedan) on a local car lot in my town.
I initially passed it up because the car fax showed an accident.
Well today I had some free time and I thought what the heck I might as well at least test drive it.
I drove it and here are my initial thoughts:
The transmission shifted slightly rough into 3rd, but once the car warmed up it seemed to shift smoothly.
I had test driven another yaris AT and I remember it doing the same thing: is this a common annoyance?
Also, I noticed the car slightly downshifting when I completely stopped.
Normal?

The car looked good inside and out; however, on the right front hood doesn't exactly match perfectly like the left side.
According to the carfax this is where the car was hit
"accident reported vehicle involved in head-on collision involving right front impact it hit a motor vehicle moderate damage reported"
The good has the same VIN number as car so I'm assuming it is the original hood. There doesn't seem to be any paint work on the car.
also on the carfax there doesn't show any indication that the airbag deployed .
The car was listed as a rental vehicle at time of accident.

Then the car was Then sold to a lady that drove it another year and a half putting 33,000 miles on it.
The car has a total of 49,000 miles now.

So, I know I had a post about rental vehicles and now I'm asking if anyone has input on whether or not to stay far away from this vehicle or it wouldn't be a bad decision depending on price point. Have any of you ever purchased a wrecked car before? Was it reliable?
How is resell (impossible)?