At a recent open mic night that I played at, there was a bassist with a Dingwall wonky fret 5er who later told me that he had a Markbass rig and something smaller for other gigs. Playing through my amp and cab, his tone was fine. However, his success rate at "right notes" was somewhere around 70-80%, and a charitable estimate of his success rate at "right timing" was 25-30%. If the intention for "right feel" was p1ssed, he was spot on.
At another open mic night, the guest house bassist played on a few songs he was obviously unfamiliar with and hit various bum notes (having been a house band bassist myself, I can completely sympathise). However, his timing was spot on, and consequently they were a lot less intrusive than if they'd been mistimed too.