A lot will depend on personal preference, budget, which park(s) you plan to visit and if you plan to eat most meals at the parks or perhaps have some at various hotels or even Disney Springs.
If you have never been to Disney, I would recommend you read the menus posted on the official Disney website to see if they offer things you like. Bad reviews often seem to be from people who didn't know what a particular restaurant serves or the style of service wasn't what they thought. If you don't like sushi (for example), then don't pick someplace that only serves that. Some Disney restaurants have a fixed menu with only a few entree choices, so it is better to know that ahead of time then be disappointed.
People can cancel their meal reservations up to the day before without paying a fee. Therefore, you might check closer to the time of your planned meals to find a spot has opened in something that wasn't previously available. Depending on you budget, it might also be cheaper to eat off-site from Disney and likely those places will also have more seating available.