Yeah, but would that be so bad? In fact I think it is how it should be.
If you attack with much greater numbers, you should win quite easily.
No problem there, we should still get enough "even" fights, so that you wouldn't be tempted just to use autoresolve all the time (which usually gives me better and more sensible results than playing myself, btw.)
Agreed. The player should play the even fights to tip the scales with the dragon while the rest of the fights should be determined by autoresolve. This encourages smart play in the campaign and prevents players from just using the dragon to win 1 fight a turn (that is your choice regardless of starting units).