My favorite is when they say " ULTRA RARE," and then have more than one listed. How "ULTRA RARE" can it be if you have multiples to sell?
Second favorite is when they list 1 of 1, only 7 graded higher. Yeah, it may be the only PSA 2.5, but there are twenty PSA 2s. And a PSA 7.
And then there is "A must own for every serious collector!" Good thing I'm a more frivolous collector.
Anyway, none of it bugs me, more entertaining. I've always had a hard time writing a description myself. You want the card to sound cool.