I can't help but think most such symbols are subtle enough to be unobtrusive, the one truly, madly, glaring exception are the Blancpain 'no-radiation' reissues. I guess it's daft of me: without the symbol the watch would be meaningless, but dear god it's the proverbial 'monstrous carbuncle...'
Beyond that it's more the case of egregious descriptors on dials that irk - it can all get a bit G.I. Joe at times, oh, and some of the plain old godawfulugly logos that brands adore - couple of absolute stinkers, albeit at the other end of the food-chain:
A Universe of infinite possibilities and THESE were the best you could come up with?!
Mind, that said, "Whitebread-but-in-French"...? Hmmm...