Ditto on the S&W 2nd and 3rd generation autos. In their own day, these were already under appreciated. Glocks and Sigs were the kewl guy guns, especially after the then new world wide web started getting involved. They are still reasonably priced on most models, though prices are climbing on .45's and 10mm's are getting scarce.
IMPE, the 3rd gen guns were accurate, reliable, durable pieces. The slide mounted safety wasn't sufficiently tactical, though, and they weren't made from high speed, low drag polymer; so right there the 1911 guys and the Glock guys disdained them. Nor did they have the cachet of German Engineering, so the HK and Sig guys turned their noses up as well.
Lastly, they never saw much use in movies, though "Resevoir Dogs" was loaded with them. Like it or not, movies do sell guns. If Tommy Lee Jones had gritted out something kewl about a S&W 4506, they'd probably still be making them today.