Our office is in the same complex as the Brazen Head, so we've had company lunches here many times. It doesn't seem to matter how busy they are, the service is always terrible. On our most recent trip, it took more than an hour for our food to come. It's not like they have an overly complex or interesting menu either. The food is generic and below average even for pub fare.
It's an all right place to have a drink or hang out, since they do have a number of large patios, but never, ever eat here. Especially if you expect to get served in a reasonable amount of time.
Bottom line: We wouldn't come here at all if it wasn't literally 25ft from our office.