That's a gentle way of putting it. The Sheraton's an above-average hotel, the Hilton is quite a bit below standard.

I'm posting an old Taipei trip report originally sent to a food group: it's dead long, and if you don't want to read the whole thing, the punch line is that the airport bus (called the AirBus), which has two routes, one that shuttles around the downtown hotels, and one that shuttles around the eastern ones, is reasonably comfy and cost (a couple years ago) US$3.