No, I would not cancel your other ADR! Granted, my experience at Maya Grill hails from 10 years ago, but it was (second only to Hollywood & Vine) the worst meal I've had at WDW. (The menu was uninteresting, the food tasted like it had been microwaved from frozen, portions were meager, prices terrible for what we received even considering Disney pricing, etc.).
I have read some online reviews that point to some recent improvements in both the menu and execution (here's a recent one - it's from a gluten-free perspective, but specific and well-written -
http://www.gfinorlando.com/2016/02/maya-grill-disneys-coronado-springs.html), although if touringplans' description is accurate, it doesn't sound like the restaurant has improved much since my visit, and I certainly wouldn't trade Captain's Grille (about which I read lovely things on a regular basis) for it!:
(From touringplans.com):
Location
Disney's Coronado Springs Resort
Overall rating: 1 star (out of 4)
Entree range
$20–$58 (child $7–$9.50)
Summary
Maya Grill at the relatively overlooked Coronado Springs is owned by the same folks who run the restaurants at the Mexico Pavilion in Epcot, but execution falls short here considering the high prices ($24 for shrimp tacos). Still, conventioneers keep it busy.
Setting and Atmosphere
The dining room, long in need of a redo, was designed to evoke the ancient world of the Maya, achieving “a harmony of fire, sun, and water.” But the idea falls short. The kitchen is open to view—but so is the barren and starkly lit walkway outside.
House Specialties
Overpriced Tex-Mex and Nuevo Latino dinner fare, such as a $58 rib eye, fajita skillet, and slow-cooked pork with corn tortillas.
AND HERE'S WHAT TOURINGPLANS HAS TO SAY ABOUT CAPTAIN'S GRILLE:
Location
Disney's Yacht Club Resort
Overall rating: 3 stars (out of 5)
Selections
Breakfast features a buffet or an a la carte menu, with such selections as a butter-poached lobster omelet and citrus-scented French toast. Lunch is coffee-shop fare including New England lobster sliders, burgers, fish and chips, and crab cakes. Dinner features grilled New York strip steak, Cabernet-braised short ribs, rosemary-brined pork tenderloin, seasonal fish, and snow crab legs.
Entree range
Breakfast buffet $24 (child $13), lunch $13– $23 (child $9), dinner $16–$33 (child $9–$11)
Summary
Captain’s Grille is a quiet spot that’s a short walk from the World Showcase entrance. Service can be a little slow, but the food is well prepared. There’s no view, so enjoy the food.
Setting and Atmosphere
Just off the lobby and open for breakfast, lunch, and dinner, the restaurant’s large, open dining room has a casual feel with nautical touches to match the hotel’s decor. A favorite of Disney cast members for lunch (because there’s always a table available and you don’t need reservations), the kitchen turns out better-than-average fare.
House Specialties
Breakfast features a buffet or an à la carte menu, with such selections as a butter-poached-lobster omelet and lemon-ricotta hot cakes. The rock shrimp omelet is a Florida signature. Lunch includes New England lobster rolls, burgers, fish and chips, and crab cakes (get a side order of hand-cut salt-and-vinegar fries). Dinner features grilled New York strip, Cabernet-braised short ribs, rosemary-brined pork tenderloin, seasonal fish, and snow crab legs.