I have had a number of guns that I was grossly disappointed with. As a lad, I could not wait to get my hands on a real german luger. About ten years later I got a deal on a shiny gorgeous luger. Boy, was I disapponted after about 50 rounds. The sights were tiny, the trigger was horrible, and its reliability was about the same as those miserable GI .45s we had in Viet Nam.
Another disappointment was a Colt Python. I saved and scrimped and prayed for years. Finally I found on at a decent price and ran to the range to try it out. After 50 rounds, I said, "self, what will this gun do that your Model 19 Smith wont"? Well the two main things that I discovered about the Python was that it scratched easier than the smith, and that parts and repairs cost a LOT more.
The latest and greatest disappointments were DAO autos from Beretta and Smith. Both companies make good handguns, but the DAOs aren't among them.
The Python above, was purchased in 1972. In 1971, I bought a brand new Government MKIV, Series 70 that was a transitional model on the first production run of MKIVs. The pin holes were so far off that I could not find a gunsmith to make it work right. I sent it back to Colt through my distributor. The reply was basically "we are so busy making so much money making M-16s, we don't need your business and really don't care of you are happy with your non-functioning 1911 or not." I stored the gun and sent it back around 1980, I got a more polite response saying that it was too late for Colt to take care of the problem. I finally sold the gun to a collector fully disclosing that it was basically a not-functioning gun.
In the ensuing years, I have talked hundreds of people out of buying a Colt product and still enjoy going by their shot show booth and telling them what dishonest crooks they are in terms that leaves no doubt.