How to effectively use quick battles (autobattles)?

bolotnik, why aren't you using the ND mod? In ND+ mode, you can replay a battle if you don't like the result. Also, many bugs have been fixed, especially those that caused unjustified victories in quick battles.

In general, it's a bit silly to use AI against AI, and that's why the AI "overperforms," and all sorts of bugs and glitches appear...

It's not silly, for example, to use two Angels to kill a horde of skeletons/gnolls. It just depends on the situation in which it's applied. And it saves a lot of time.