I've had junk drills untwist, like the ones that come in the Ikea packets and hardware bonus pack junk. But the drill is only a part of the equation. Two flute twist drills grab sheet metal with great force as we all know. A single straight flute drill with a a 90 degree cutout does a lot better job of keeping the hole round as the point of the bit passes the edges of the hole being cut, where two flute drills grab and make a mess of the bit and work. Then there are annular cutters, which can do well on sheet metal with the right setup. Take a look at a Unibit step drill, which is made for rough handling and hand-held drilling through sheet metal panel enclosures. They are well-mannered because of the single flute.