Well, gotta tellya, if you don't let someone know the service won't get better. Turnover in the restaurant biz is high, bad service migrates from one place to another. Very soon you have a whole industry dedicated to charging you for poor food and mediocre service. It's not complaining, it's letting them know that your expectations weren't met.

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman