What makes them "beautiful" is how they function under pressure. They are a bit like the old tagline from the Bic ballpoint pen advertisements. The pistols work "first time, every time". This is why you buy a "working" handgun. While aesthetics are nice, "form follows function" is a highly important aspect of firearm production.
Recent Bersa pistols, such as the TPR series, have become a bit more "stylish" (taking on a Sig-like appearance). The TPR Series uses Sig-type sights and is directly interchangeable with them. The Argentinian Police and the National Army use their TPR9 Series pistols. Look it over and shoot it before passing judgment. I think you'll be pleasantly surprised. You may come away with an entirely different perspective.
If you gave me a choice between my Thunder .32 and Walther PPK, I'd take the Bersa. Why? A 6-pound DA trigger pull and a 2-ounce lighter weight are my initial reasons. I can whip out my Thunder .32 and routinely dump 10 rounds of hot FMJ into a circle the size of a teacup in less time than it takes to tell.
The Thunder .32 is slightly larger than the Walther. This gives the shooter a bit more control. Accuracy accompanies this "minor sacrifice". I can live with this. The pistol carries with it a bit of the "Bond, James Bond" panache borrowed from the Walther. (I'll take that as well.)
The price point of the little pistol is the "icing on the cake". ($293.00 beats the heck out of $700.00+ for the Walther).