45 ACP is a low recoil round compared to 40, and it's better than 9mm in the compacts even. 45s have a bad rap just like fiscal conservatives. Neither is justified, but there are lots of under educated people that like things that way.
If there is one legitimate complaint against the 1911 it is the barrel link and rocking motion it creates with the barrel. Sadly though there are probably billions of rounds fired successfully and accurately to debate that argument with as well.