While I give guys like Duchamp credit for having a style that's so clearly their own they don't even need to put a label on it, with rare exception, I find Duchamp shirts and ties just obnoxious. They're so extreme it's almost a caricature.
I'll make a similar comment of Lacoste. In their case they're clearly logo'd, and sure they have some nice basics like polos or shorts or whatever, but for the most part they've pushed the line, especially across the past 10-15 years and made some truly godawful stuff.
Lastly, I have a special place of hate in my heart for large labeled Tommy Hilfigure items. More often then not, they're such ugly items that the person would never otherwise wear except for the logo. To me, that's the epitome of gaudy, when it's really only being worn because of the logo.