I have lived in the North East for 7 years and only went there today.
Had friends from London who wanted to see Hadrian's Wall and we had small children so couldn't go very long. When I looked on the web, all the good wall places were expensive and owned by English Heritage or National Trust, a real scandal. I found this on the web and our expectations were low. At least it was free.
It was really good on a number of levels. Our young children could roam freely and safely across a large expanse. They liked to walk on the old walls. Our history bluff loved the Roman stuff. My wife really enjoyed the mock up old villa which really bought the Romans to life. The fort had great views.
What was really good was that there was not many people there on a Bank Holiday Monday. I hate the attractions where everyone is over each other. This was a calm and pleasant oasis.
Highly recommended. Probably the best attraction I have been to for a long time because of the serenity.