As a former bartender/waiter/pizza deliverer:
First of all: Who in the blue hell went and made 20% percent the minimum gratuity when I wasn't looking?
Why didn't I get a memo about this?
When I was a server 15% was a good tip, and in my estimation still is a good tip. When I get good service I'll toss on a few extra bucks. But that is by NO MEANS a given. You want more - work for it.
I even tend to give the full 15% gratuity even if the service wasn't stellar, as long as some modicum of effort was made to be mediocre. I quite understand that people have off-days and sometimes its' really busy and you can only do so many things at once - and as a former hostage (I mean "employee") within the foodservice industry I understand this, and therefor I make allowances.
I do, however, expect good service when I'm paying for a service, and I try to reward it when I get it.
Second of all: I remember when I was a waiter and when I was a bartender - I have to tell you people - XOXO17 has a point. As a rule, Southern Maryland patrons' tips ABSOLUTELY SUCK.
No seriously.
I see a lot of attitude in this thread about this assertion, but I'm telling you right now, it's true, and I don't give a good goddam if that offends someone.
I was a good bartender, and during my brief stint in DC, and my briefer stint in Baltimore, I was rewarded for it. However, back home in Southern Maryland when I was a bartender, (and on those occasions when I had to wait tables), I was not rewarded for it.
I wasn't doing anything differently. So either the expectations are unusually high south of the beltway, or the consumer base is, on average, much stingier. Guess which side my wager is on.
And don't even get me started on the time when I was a pizza delivery guy - the tips were abysmal.
ABYSMAL.
Some of those people should be ashamed of themselves.