Generally speaking if you're within range for their skill to hit you, you're doing something wrong.
That aside, what are you doing playing nasus in a game that lasts less than 15 minutes? The " you're not manly enough if you don't nasus in doom bots" is a meme for a reason, it's probably the worst choice possible.
Also exceptions exist.
is arguably the most broken champ for this mode. If you play it right and keep kamikaze down the lanes you can even solo teemo.
might not be the best choice for lvl 100 gauntlet, but in lower levels you can
and permanently kite 5 enemy doom bots while the rest of your team blows teemo up.
bait doom bots into your boxs, stealth away. Not the most efficient doombots killer, but you can't say he's worthless.