1. Can't answer about it myself but I've had several friends who have done Sports Science and they all really enjoyed the course.
2. It's hard to get a feel for somewhere on open days. I've always enjoyed Brunel a lot more than other Universities I've visited friends at.
3. We have a night club and 2 bars on campus. The night club does tend to have different music nights on and their is a club in Uxbridge that everybody goes to on Wednesdays. There are often coach trips to central for freshers and face week (First and last week of term) and it's not too far to go into central for a night out clubbing.
There is a night bus that comes back to Brunel from Oxford street and taxis, though expensive can be around £50/60 so with 5 or 6 of you a tenner each.
4. Uxbridge isn't too bad, I've never had any problems though it seems a little bit full of the elderly and of chavs but it has everything you need, if you want somewhere more upmarket for shopping you can always take a bus to Westfields shopping centre (40 min/hour journey)
5. We have Rugby teams, both League and Union, take a look at this link for more information
http://brunelstudents.com/sportsclubs/I will add that a friend in first year studying Sports Science decided to join the local Rugby team rather than the Uni one (He said he didn't think he was good enough to get much play) and he playing local, so that's always an option too but the Uni should have a few teams.
6. The Uni will usually have a book or online listing of placements offered to placement students but you are also always free to find your own. I am not too sure of what Sport Science placements are like unfortunately.
I've just graduated but I really enjoyed my time at Brunel (so much so I'm applying for a pgce here again), it's a single campus and with so many clubs and societies it can be very social if you chose to put the effort in and join things.