Absolutely nothing.
Good car, inexpensive, and stylish. If you take care of them, they'll last forever (so I've heard).
I put 132,000 trouble free miles on my Protege before I sold it. Now as I sit here lamenting the repair bills on my 1999 Ford Ranger (46,000 miles), I wonder what I was thinking selling that car.
I just bought a pre owned protege with only 12,ooo miles on it. I have had it two weeks, and I much prefer it over my previous car, a pretty nice buick century. the mazda is bigger on the interior, and has a great sports car feel. I hear about the ford focus all the time, but I much prefer this car.