It seems people have very different expectations about what levels should mean, so here's a poll.
Take a 10th level fighter and N 1st level ones. Put them into a fair fight with no environmental effects. How large should N be for the odds to be 50% on the 10th level one dying?
Take a 10th level fighter and N 1st level ones. Put them into a fair fight with no environmental effects. How large should N be for the odds to be 50% on the 10th level one dying?