We see Mott in a handful of episodes, only in one or two episodes -as I recall- where he has any meaningful dialogue or interaction with the crew. Where he simply talked their ears off and offered advice to them. In other words, being a barber.
How that's more insufferable than Neelix's appearances in 150+ episodes of Voyager where in pretty much every single one he offers nothing to the story or plot other than "comic relief" is beyond me. Take his last episode where he's trying to "cheer up Mr. Vulcan" by dancing to "generic 20th century rock and roll" and is dancing with a grin on his face. I can't even THINK about that scene without wanting to punch Neelix.