Having criticised the lack of consistency at the front desk, I would have to agree with you about the overall quality of that property. It is second to none in the vicinity of the airpot. The staff get to know you remembering your name and treat you well (especially in Toucan's Pub!). If I had to come up with a complaint it would be the limited window area in the suites - always dark inside even on the sunniest of days.
You're also right about the Hilton - definitely not up to snuff. Have you tried the Holiday Inn Select nexy door? It is almost on a par with the Marriott.