As I say in my title, this is one of my least favourite castles - and I've visited most in England and Wales. For a military building, there's precious little to see and no access to the top of the keep (why not?). As a stately home, again, it's all pretty unexciting especially when compared with Alnwick and Cragside - even Lindisfarne is more interesting.
In one way, it reminds me of Leeds Castle in Kent: it looks far better from a distance.
If you're on a limited budget or only there for a short time, give it a miss. Alnwick, Dunstanburgh, Cragside and Lindisfarne (to name but four) are far more rewarding.
To be fair, other people who have reviewed Bamburgh have clearly enjoyed their experience. However, too many have expressed concerns over the attitude of certain staff members.