the terrain is quite good, no huge hills, and a little bit of tarmac.(well the half was anyway)
however, it was the organisation that was the problem. prepare to be self sufficient, eg carry all the water you need and your own gels/food etc and dont look to the marshalls for support and you should be OK!
However, to be fair the organisers may have taken note of the feedback this year and there will be a whole lot of improvement.
the endurance life events are better run, if you want an off roader, or try the purbeck marathon for a bit of a challenge (nice hills!)