i think generally when you stay in a 5 star hotel, the service tend to be better. and if it is a worldwide brand, their service standards are quite good and they will go out of their way to help you. you can also find such service in 4 star and below hotels, but its quite rare and its dependant on the staff's mood. but at a 5 star hotel, such service is expected. of course once in awhile we might run into a service staff who is just having a bad day and might end up giving a lower service standard. they are human after all.