A good lawnmower beer and I think of a Kolsch, cream ale, pale continental lager, even a Berliner weisse, or a crisp German pilsner. The key to me is crispness and thirst quenching and think all the fore mentioned fit the bill. They are all subtle beers, but never boring: you can down them quick or drink them more slowly and appreciate the subtle complexity. Not everything needs to be over-hopped and over-bitter. Do they need to be crap, i think quite the opposite, they need to be brewed well because there is nowhere for the off-flavours to hide.