If eating in tourist areas not only will you "pay through the nose" but the quality on offer is usually subpar. Taste or lack there of is also very subjective, in all things.
Interestingly many people have told me, and posted here on DRuno I believe, that the McD's in the DR is different and possibly better. I can't recall the last time I was in one since I don't eat fast food and definitely not McD's. It may have been about another franchise but the thought is the same.
I would however like a piece of the profits since Dominican's seem to love American fast food. I'd much rather exist on rice and beans. Luckily I have options and am a decent enough cook