Xx, there is nothing wrong with Sigmas. They are reliable, accurate, and durable. I own two myself. Now as far as the price, you did overpay, but live and learn. Not the end of the world. I have shooting for over 45 years and have overpaid for guns and stuff, but it comes out in the wash in that a number of guns have been given to me. Years ago, guns were only discounted a small amount under list. Today, with the free flow of information on the internet and the ability to buy off of various on line sources, the competition has forced the prices down further from list.
The only reasonable argument against the sigma is the heavy trigger pull. If such pull is a problem, go to Wolf Springs and order a lighter striker spring that wolf makes just for the sigma. It will make the weight of the pull more desirable.
Those who do not receive this weapon well, outside of the above issue, are individuals that are under the delusion that judging a gun solely by its price as an accurate measure of its real worth. Buy what you can afford and what you bought is perfectly fine for informal target practice and home defense. The gun is not a bullseye gun, but neither are glocks, xds, or any other weapon in that class. They are all defensive type pistols that are best used in scenarios of tactical shooting utilizing humanoid targets. Want to shoot bullseye for cash prizes, get ready to spend a few thousand on any number of firearms that are made for that purpose, which is exactly what your competition will be doing.
Good luck in your new purchase.