I have a free standing gas oven. I have always loved the cooktop gas part and had it in my previous houses as well. The actual oven part I'm not so fussed on. I prefer my previous wall over with it's lovely fan forced capability which the gas doesn't have.
I find it hard to get great results with roasts mainly. Other things like pies, cakes etc I have no real issues with.
My oven runs on gas bottles as opposed to natural gas however, not sure how much of a difference this makes.