OK, I've been to Guam many times, having stayed in several of the local hotels. My first choice would be the Sheraton, but that was sold out on my last trip. My company booked me at the Marriott. I was skeptical, but a coworker said it was OK.
If I'd been traveling for vacation, I probably would have never checked into the Marriott. The parking garage was difficult to navigate, in poor repair and dangerous. Imagine high speed traffic on blind corners that are also pedestrian walkways. I felt like my trip from the car to the elevator I was literally risking my life. Only, when I got to the elevator I discovered that it was out of order. So I risked my life to get to a broken elevator. Great. Not a good start.
The layout of the property is bizarre. Once you get to the lobby level near the parking garage, you are nowhere near the lobby. You are also nowhere near the (other) set of elevators to get you to your room. If you forget something in the car, it's going to be a long and dangerous journey from your room back to the car.
Internet is slow (like, dial-up) and expensive. At one point, I was told that Internet access is free for loyalty card holders. But after I signed up for the loyalty card, I was later informed that Internet is NOT free for loyalty card holders...just wireless Internet is free. (???)
The guests at this hotel seemed to be an odd mix of 50% soldiers in (battle fatigue) uniform and some kind of convention. This made riding the elevators (the working ones) a bit of a chore. Imagine riding up 10 floors to get to your room, when the elevator is stopping at (literally) every floor. Lots of people going up or down ONE floor to visit other guests. Oh, and I have nothing but respect for our soldiers in uniform. It's kind of odd to stay in a motel filled with them, though. I was on a business trip, but even so the atmosphere didn't "feel" like a hotel. More like a barracks.
The room was in poor condition (carpet needed to be replaced, sink cracked, overall decor was extremely dated, TWIN size beds that were uncomfortable...)
I think if this Marriott was located somewhere like Boston (for example) it would be sold and/or closed within 6 months.
I'll give it 2 "dots" rating just because it is easy to find worse hotels in the Guam area (unfortunately). For most areas, this Marriott wouldn't deserve a single "dot" rating. For Guam, it's not terrible.
If you are going to Guam, book the Sheraton, the Westin or the Hilton. I'm also told the Outrigger is nice.
My tip would be to book the Sheraton, if you want a "good" room
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.