A nice cup of coffee is one of my great pleasures, however, the coffee is absolutely horrible at almost every hotel I've ever stayed at. The good coffee I've had has been at random places in central America and in Kenya, everywhere else the beans are invariably of low quality, over roasted and old and in many places a nespresso, which is even worse.
I remember FDW mentioning kroner's coffee in Kreurig and have several similar stories, and every Aman, FS (except when Baltimore had La Mill), Westin, has just had bad coffee.
For me, coffee is an important drug and a huge luxury. But why are the hotels skimping so badly?
I have to agree with the sentiment about Aman resorts. They usually have below-average coffee, with Amankila being the only exception (had had Bali coffee served in french press).
Another issue is that many hotels - instead of buying the right equipment and training their staff properly in using it - simply buy a fully automatic coffee machine that makes cappuccino at the touch of a button. It usually tastes terrible. Worst example is Rocco Forte Villa Kennedy in Frankfurt, which has coffee not better than the one from a vending machine. And that for an Italian-owned hotel.