Service: Poorly timed dishes
Your friends have their appetizers but yours is still sitting under a heat lamp in the kitchen. Or you’re all eating your first courses when the main dishes come out. Or the gap between firsts and mains stretches out for 20, 30, 40 minutes. These issues are usually not the fault of service but of a badly run kitchen, but your server should notice, update you on your order’s progress, refill drinks if needed, and just generally make the situation as painless as possible. But of course, that’s not likely to happen in a bad restaurant.