COuntessDracula, we have stayed there during summer months. We had a suite, where the children were in the sitting room.
Food was fine, but we were there for a week, so I was dying for something simple by the end! Our room was opposite the laundry and every morning at 6am, the night porter would do his final checks, bang his way through the fire doors, bang his way in and out of the laundry, and they have VERY squeaky floorboards. Drove me MAD! This was our first holiday when the children weren't waking me at 6am (or earlier) and we couldnt enjoy that extra peace.
No beach, there are views of water, you need to drive into Weymouth, which is great, we really enjoyed the beach there.
We had also been to Fowey in Cornwall and really enjoyed our stay there, we would definitely go back to Fowey, but not to Moonfleet, don't know if that helps you!
I imagine main school holidays could be childhell for your DH, we went before schools broke up so its was mainly babies and tiddlers.
The pool is quite tired, but there is a nice lawn, with seats and hammocks, swingball etc.