Brake Rotors @ 20K (Living with it... apparently nothing "wrong")
Transmission Fluid Gasket @ 45K (Leaks into Fuel System)
Spark Plug Wires, Ignition Coil @ 55K (Misfires)
At the time, this was the first decent looking car Pontiac had produced in years. The GT was thankfully ignored when the usual Pontiac plastic trim/ground effects were slapped on everything that rolled off the factory. So looks were a plus.
Generally, it is clear that this was a new model, and tweaks should have been made which I don't believe have been. Example, the brakes on the car leave something to be desired. Larger rotors would be nice.
As for reliability, it's an American car, and I have had it. I owned a Chevy Cavalier as my first car, and for 12K, I got what I expected... a decent entry car for a college student on a budget, some repairs over it's lifetime, but all in all... I was neutral on American cars.
I traded in and up to a Chevy Tahoe, hoping that the truck-division has been getting it right. Family have owned several Tahoes for years with minimal repairs... mostly insignificant items.
The Pontiac was a second car in the family as the family grew... and after 55K miles it has been disappointing. It isn't a lemon, but it just isn't worth it.
I receive a GM discount through my employer, which made the difference in price up front... but the amount of money you have to pour into the vehicle for repairs more than offsets the price of a comparable Japanese vehicle. From now on, it is Honda/Acura, Toyota/Lexus.
Foreign cars suck, and take all your money.
I owned a Honda and a Toyota they both sucked big lemons, you buy a USA car you don't need to put all your money in it just to make it climb hills, sure you have normal wear in a car and minor repairs, but I will never buy another rice burner again, buy a bike a 10 speed is faster then a rice burner, other wise stay with American.
If you really have tranny fluid leaking into your fuel system like you stated, I think the car is not the problem, fire the mechanic, and if you are looking into a lexus, you obviously don't need to be driving a budget tuner!!
Have you noticed that the more foreign cars on the road, the harder is has become to find a good job? The Japanese only "Assemble" 1 out of 10 cars they sell in the US.