i have to say, i have never had any bad service anywhere (my oh says i scare them!). but i am always pleasant to waiting staff and thank everyone so it's not that i am aggressive or scary.
but we were at a dinner dance a number of years back and the food was stone cold when it arrived. everyone, and i mean everyone - i earwigged other tables - was moaning.
anyway, the general manger came around the tables enquiring if everyone was enjoying their food and i sat (almost) open mouthed as everyone said 'oh, yes, lovely' and so on. when he got to me i said 'well if you like stone cold food with the veg arriving in stages, then yes, it was grand.'
the result? i had a totally fresh (hot) plate served to me within minutes with all my food fresh and hot.
pays to speak up sometimes.