I have 3 recipes in my aresenal that no amount of tinkering and conversion from extract w/ grains to all grain has gotten me close to the taste of the original. So when I brew them, I brew them with extract.
Yooper's dead guy clone, my really simple amber ale that tastes dead on like Bell's Amber, and the brown ale in my recipe pulldown, although it doesn't taste "better" as an extract with grains recipe...it tastes to me just as delicious.
You might find this thread intersting as well...
http://www.homebrewtalk.com/f14/better-extract-recipe-132651/#post1492560