Don't get me started on discretionary service charges!
DH and I once went into a restaurant opposite the local cinema for a couple of burgers and a drink each, it was horrific service. One burger came 15 mins later than the other one, a drink never arrived in the time we were there, etc. Couldn't get a waitress to get our bill so missed the start of the film (surely 2hrs is enough to grab a simple meal for 2 opposite the cinema?! We'd waited ages for someone to get our order...)
Anyway, when the bill eventually came (from a male waitor who arrived looking surly as I'd gone up to the "please wait here for a table" bit by the entrance to ask, since the waitresses kept saying "just a moment")... he had the cheek to roll his eyes when I snorted and asked for the 15% service charge to be taken off!
Lucky we didn't just walk out after leaving a tenner for the ingredients that day - "service" my arse.
So yes, I have removed the automatic service charge on these things - and got no end of stick for it. DH even wanted to leave it on "so there's no fuss"... it ended up taking another 10 minutes to get it rebilled.
In fact, I'm so annoyed by this now I am going to go and write this on trip advisor, i always meant to, but just forgot. 