Worst: Every Rossi I ever bought. At one time I had five of them, pistols, rifles and a shotgun. Crudely made, finish was fair at best, never had one that was accurate. Sold all the long guns and kept the 22 revolver so I could pop off the side plate and look at the internals in the unlikely event I ever got the urge to buy another.
Best: Anschutz, BSA Martini International, Voere Titan, various Miroku reproductions of Winchesters, Steyr.
A special mention goes to my JC Higgins Model 50 bolt action in 30-06. Sears sold these in the early 50s. They use FN commercial Mauser actions, chrome lined High Standard barrels and are extremely accurate. Best of all because of the Sears connection they were cheap, at least before word got around on the internet. From a quality per $ standpoint they can't be beat.