Ruger makes some good revolvers and I have owned several, but their quality control is sometimes terrible. So, yes, the worst revolvers I ever owned have been Rugers.
I recently purchased a Ruger single 10, .22 long rifle revolver and the chambers were too tight. I couldn't even get the bullets to go in the chambers, and I tried several brands of shells.
Another Ruger purchased brand new, Blackhawk 45 convertable gave all kinds of trouble when shooting 45ACP ammo. It was a headspace problem, and very ammo picky, and would jam up solid.
And that's not the only two, just the worst two. However, I still own a few good Rugers, but it is sad how many get out door with problems, to the point I am just about weaned off of them.