I was there in 2008-2011, so a fair amount of time ago by now...but I had no issues with it at all, and I don't think it had a bad reputation then!
The accommodation has had a lot of changes since I went (but in a good way!), but the campus is obviously not that much different, and it was fine. There's one club on campus (although I was never a massive fan, but in the big scheme of things, it's fine!), there's 5 or 6 bars so nightlife on campus is good and there's loads of pubs and bars in town obviously. There's a small SU shop, which is pretty average, same as most unis I'd guess. Library I am not an expert on (I may have gone in there a grand total of 3 times during my 3 years...), but seems fine, lecture theatres are nice and big, the facilities are good and the teaching tends to be very good.
Don't worry about the rankings too much either way, the most important thing is to go to the uni where you feel happiest and where you're most interested in the course content ultimately. But don't let other people's comments about the campus put you off - I had no issues with it at all, and neither did anyone else I knew there!