Posted: 28/03/2014 at 09:27
Is it in heavy shade all day? It looks like a combination of poor drainage (clay underneath?) and too much shade or something trampling all over it.
When you say you have treated it to feed, weed, and seed, twice, when was this?. Its too early in the year for a response to that regime . If you have recently seeded and it is not waterlogged or been eaten by the birds, seed should start to grow in the next month.