The last time you went to your favorite restaurant, did you really take in what makes it your favorite?
Is it the food, the atmosphere, or the staff. Maybe it is even some combination of those things.
Before you start a restaurant, consider carefully what you want the experience to be like for your clients.
You might have the best food in the world and get it done quickly with perfect presentation on the plate. But, if your service is awful, you can forget the food altogether.
Unfortunately for any business, the negatives will stand out and word of mouth gets spread faster than the good, so be careful and think out your plan.