I'm not sure what kind of thing you expect really, and when I've been there before it's been on informal visits, to see a friend rather than open days or anything like that so I can't tell you much about the lecture theatres or anything like that.
Other than that... Well what can I say that hasn't been said already? The halls aren't amazing, I've been in Mill Hall before and it's not as nice as Creed Court at QMUL where I used to live... not as big and not as well put together but considering it's all only for a year and students aren't exactly looking for interior design exellence it's whatever... And they used to run a sweets delivery service! I don't know if they still do but it was cool.
The campus is nice, as is the student union... I really liked Locos, the chips are well good! It's nice because it's quite urban but far enough from central London to have more breathing space. Didn't go into the Academy, was only 16 at the time... The town centre is nice too but I doubt you'll go into that? It's like a more urban version of where I live now really.
Don't really know what else to tell you ha, it was a long time ago but since then Brunel's always had a place in my heart lol, so I guess that's saying something.
Sorry for the essay!