I, honestly can't think of a single one; including a number of lenses, I have given to relatives for their use. The lenses, I currently have for myself are listed in my profile and here again, I consider them all as having been good/exceptional purchases, at the time I purchased them (and, all were purchased brand new, since the year 2005 when I got into digital photography as a "hobby)". 
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BRJR ....(LOL, some of us are quite satisfied as Hobbyists ..)
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BRJR ....(LOL, some of us are quite satisfied as Hobbyists ..)
Mine would be a Canon 75-300, didn't like the IQ and the plastic feel of the lens. Recently sold it on Ebay.