Well I've never cooked a roast & I don't plan to start LOL. Though we do have one often on Sundays or special events......my secret to a great roast is "let DH do it!!!", he's also the cooker of steaks & potato bake.
DH has some contraption he made out of a beer keg, kind of like a webber. When we have a roast he cooks it in there outside. I don't do anything but eat it....works for me.