Before 1.08 one of AI had infinite debt bug, so he pumped out many troll packs and sent all on me. I really liked that situation, it was at least challenging.
I liked it until first battle that took 45 minutes. My archers did 1-5 damage, i had 4 units with one caster (i used his mana to freeze trolls). Each animation of archer shooting lasts about 10 sec. Troll packs had 1000 sometimes 2000 hp for bigger group. Now imagine around 300 turns for one tactical battle.
I could not use any other kind of units because they would get hammered in one or two tactical battles and casters could not replenish mana fast enough.