I think open sights are under rated. When I was a kid that was all I used, albeit it was not on anything center fire. It took me some time getting used to peep sights, which I now have a fondness for. If you don't believe in the effectiveness of open sights then try shooting without anything.

"The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." John Stapp - "Stapp's Law"
"Klaatu barada nikto"