My mother-in-law had to be fitted for dentures, and I had no idea how elaborate the process could be. The dentist takes a lot of measurements and x-rays, then sends all of that information to a denture specialist, who forms molds and handcrafts a set of natural-looking dentures. The teeth in a set of dentures aren't always perfect, since they are trying to make them look as natural as possible.
My mother-in-law told me she enjoyed getting the ability to eat solid foods back. Without her teeth, she had to eat a lot of soft foods and soup, but now she eats steak and raw fruits and pizza. Her speech can be a little affected, but we can still understand her. If the adhesive fails, her dentures slip around and she gets a little self-conscious until she can fix them.