Hilton branches are my employer's hotel of choice whenever they send me away for work. I've never had any problems with them - clean rooms, well-equipped, polite staff, good facilities. The breakfasts are nice too. There are branches in most major cities and they're usually nice and convenient to get to from the airport.
The only reason I don't give them 5 stars is the prices. They're insanely over-priced and it takes a lot to get status with them. Sure, if someone else is paying your bill then they're a good option but they're out of the range of most leisure travelers I know.