I'm at Lancaster now.
1 major nightclub? Ehrm.. You've been missing out!
Lancaster uni is absolutely amazing, and the nightlife is great. Me and my flatmates go out around 4 times a week. You're guaranteed accommodation on campus the first year, so you're >15 mins away from your lectures every day. The learning zone is open 24/7, and is absolutely great. At least on my course, I feel they follow up their students really really good, at least much better than when I went and studied in Rome, Italy last year.
It's real easy to make friends. Maybe it's not situated in a massive city, but you're a 5pound taxiride away from the trainstation and can easily go on day-trips to both Manchester and London.
Shopping is not that big, of course, in Lancaster, but it's alright. It has everything you need, and if you need more you can easily go to Manchester, as I said. I absolutely love it here, but by all means.. If you think it's a "bad uni" because of what a couple of randomers said on the student room, then go for it.
Good luck with your choice!