A poor choice, although I'm told it's some of the better fast food in the Park. If you are willing to take the time and send the money (we weren't), Epcot has some great sit down restaurants.
Fairly typical americanized Mexican-ish foods, at inflated prices and long lines. About on par with a Taco Bell, with less options.
The advantage is that the tables (all outside) have a lovely view over the lake, and a nice breeeze.You can see most of the "countries" from here. No tables designated as handicapped, but easy enough to pull my chair up at one end. Aisles were roomy enough to manuever alone, but a bit tight when I parked- Kids kept bumping into me, which left some interesting salsa stains on my shirt. Lines would be difficult in chair, I waited for a table while my party waited for food. A motorized chair would be much more difficult to manuever, I'm sure.