I agree with people that say that it's swings and roundabouts. Sometimes I get great service here, sometimes crap. Same with the States. I think the absolute worst when it comes to customer service was some of the service I got from Verizon. I once called them when our phone kept going out and was told that it probably had to do with the rain. Yeah. Because a snow belt city's infrastructure can't handle drizzle. And then they made me switch my long distance to them in order to keep from having a cap on my account (this was before Skype and Vonage). The minute I got Vonage, I dumped Verizon and would never go back, even if we moved back to the States. I would use a friggen PAYG cheapy mobile before I signed up for Verizon again.
But here, what drives me nuts is when they adopt the practice of checkbacks (usually in a chain), and then get all defensive when you actually offer a complaint. Maybe this happens in the States, but I've never encountered it. It's happened several times here, and TBH, I rarely do complain, but every single time I have, it's always something to do with me. Chips undercooked (raw in the middle actually), well it's because that's how they do them there (I think he actually meant in the UK...little did he know that it was my British husband's chips and he was in the loo)--Giraffe who usually have awesome service, and that's why we go. Appetizers frozen in the middle, it wasn't frozen, just meant to be eaten fast. Must have gotten cold---Pizza Hut. Crust too hard to cut even with sharp, serrated knife? That is how authentic pizza is made, you American--Pizza Express.
All of those places, particularly Giraffe, we've had great service. However, they shouldn't ask if everything is OK if they actually want to hear when things aren't. If they are asking to try to drum up more business in the form of side orders or the dessert menu, they should directly ask for that.
Another mixed bag: Cunard. We had great service (room steward and 95% of the people we encountered were awesome). They just hired a few tools (head waiter, the fitness consultant) and have an awful customer service line. Sure the people on the customer service line were nice enough, but the wait of at least a half an hour every time we called sort of sets the mood.