yeah the more I play and read about other games, the more I'm coming to the conclusion that the Instant Death Mechanic is one of the worst ones in the game.
Its far to easy for some armies to exploit and makes entire unit choices obsolete unless their T and W scale together, thereby cutting off an entire design mechanism. Other games I've played either forgo it entirely or limit it to a prescribed set of "wounds" and they seem to suffer much less in terms of multi wound scaling.