My neighbour has gone down the full "Monty DonTichHamiltonDimmock" route and watered, scarified, weedkillered, top dressed, reseeded and generally pimped up his lawn - he even has bits of string all round/over it with CDs hanging from them to scare off the birds who are eating his seed.
It now looks fecking awful with big black patches all over.
I have left mine to its own devices for the last three months or so - actually mowed it yesterday to control the weeds a bit & it is now beginning to look OK again - in fact it looks far better than my neighbour's - he is not best pleased :)