I've lived in Exeter for over ten years on and off. The question of how good the nightlife is really depends on what you're used to. There are 3 clubs, which are all pretty terrible compared to clubs you would find in bigger cities, but there are a few bars that kind of have dancefloors and play music (i personally wouldn't class those places as clubs though) and a few good pubs. If you're from a big city then you'll be very disappointed with Exeter's nightlife, but if you're from a small town you might find it ok. Obviously if you're out with a good bunch of friends then you can have a good night anywhere and you will be out a few nights a week at student nights. It definitely won't compare to bigger cities like Newcastle and Leeds. I would personally say don't come to Exeter if nightlife is really important to you. Just my opinion.