I actually like Westin's gyms as well. I also like the "partnership" they've got with Runners World, where most will have maps of local running trails...many of these are downloadable, so I can print it off and have it ready for use right upon checkin. Their equipment is usually really good, and often, they put their gyms in great areas.
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Example:
Westin Costa Mesa: the treadmills face a huge window overlooking the pool...which, depending upon the, uh, "scenery" therein, sure beats any view the treadmills at my gym have, and makes for a nice, uh, cardio workout. Yeah..that's it. .
Non-Westin example:
Sheraton Libertador, Buenos Aires: the gym & pool on the top floor give a GREAT view of the city while you're working out or relaxing in the pool/jacuz.

Aside from these, yeah, most hotel gyms are a sorry excuse for putting "fitness center" on the desrip. I can usually count on their weight machines being poorly built "combo" universal stations, with the pulleys not working. They usually have at least one treadmill that's bearable, and so if I'm not at a Westin, I'll just plan on using that since I can count on the weights not working.