You know what you are going to get and they deliver what you expect.
From the interior design to the bread sticks to the salad to the pasta to the desserts ... you get a well crafted experience.
I think they also do a good job on customer service whereever you may go.
That's a successful formula....
The local one-of-a-kind Mom and Pop MIGHT be "more real" by whatever measure you want, but it's also often hit or miss, especially if you are on travel or not a local.
Olive Garden is always going to give you the experience you know and expect.