Certainly for the price you pay they are extremely good value. Try getting from the equ. in London of Cwb to Central for 3 quid, and Cwb to Tst for 4 quid. Just does not happen.
I have been using them on an almost daily basis for years, and rarely find direct rudeness. Maybe they don't reply when you get in, or chat, but that's not a problem. No one has ever smoked when I am in the cab, but certainly some have done so when it's empty, ditto eating pungent food. Open the window for a bit if you find it offensive.
You will always get the Formula 1 wannabes in every city of the world, not just HK. More annoying is the stop/start style of driving that's supposed to save petrol. Not much you can do about that.
If the driver does not know your destination, simply point at his radio and he will let you call his controller who will give him instructions. I have never failed to get to my destination, although I have been taken the "scenic " route a few times.
I would be grateful that you have some of the most reasonably priced, and easily available 24/7 taxis in the world. Another example also using London, try and get a cab at midnight in Piccadily,it ain't going to happen, compared to Wyndham Street, LKF same time to 3 am.