the knife that i tossed was a rough rider or whatever that chinese copy brand is. They're "ok", but the first one I had was junk. It had enough side play that you could make a musical instrument out of it, but no big deal opening boxes and cutting tape and orange peels.
Shortly after I tossed it, I got on ebay to get another one - same type (small lock back), and to my surprise, it arrived without any real faults other than that it's a little bit overly tight - but no side play.
I figured they'd all be sloppy, and this is by no means an endorsement to buy them. This one, instead, closes off center - but manages not to bang up its blade. Sometimes throwing something away and getting another one is a moderate improvement!!