We don't really get franchise restaurants here. Or atleast, not many.
I suppose it depends on what you allow to be a restaurant. Like, Fast Food places are technically restaurants, but it's a different atmosphere I find.
If we include them then I suppose KFC, since I like the food and it's a decent place to share a meal with friends and have a chat and catch up.
Other than that I can only think of Wetherspoons (which are really a franchise of pubs that do food) or maybe Harvesters, which aren't that great and I don't have any near me.