In May 2013 we stayed at the JW Marriott Resort & Spa right next door to the CasaMagna Marriot. After the nightmare at La Capilla's Argentina Steakhouse (see my other reviews) we thought we'd give Champions a try. The service was prompt and except for cold fries the meals were OK; but the place was very loud. None of the TV screens seemed to stay on one sport, they kept skipping from baseball to basketball to American football etc. As I'm not American none of these sports interested me, although I found basketball quite interesting after a while, however I still wouldn't go to a match. I expected to see a bit more football considering we were in a football mad country.
We ate at Champions 3 times in total, basically because there are are no decent restaurants in Cancun that aren't "A la carte", or we couldn't find them. I lost count of the number of times I walked into a restaurant asking for the menu because there isn't one outside, and when I asked if they were "A la carte" they were not happy when I walked out. My experience was that "A la carte" in Cancun means rip off the tourist.
I'd only recommend going to Champions once, after that go to McDonalds or Papa Johns across the road as you'll be ripped off in the other "A la carte" restaurants in this area.
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