I like a bit of grey, but that really is too much. The estate agent's photos aren't great either though (or should that be grey-t!) as it makes the house look so dark, when actually a lot of the grey is on a brighter side.
It's been on the market quite a long time now too.
The garden would be the deal breaker for me though - it's easy to add colour to a grey house, but there's no using that lawn! Doesn't look fun to mow either.