This mod is trying to make combat fell more live and strategic than vanilla. In vanilla HOMM V, 90% of the time you already know, how the battle will end, but now you have much more opportunities to engage or defend yourself againts superior force of enemies. There was lots of units in every faction, that were so boring and useless in all kinds of battles and in general everyone was using just 3 types of units to win the battle. Now its not so important to have 1 overpowered unit but more units with good positioning, but that doesnt mean that you are not capable of dealing high damage with single unit. Now you have two options during buying units in castle, both second and alternative upgrade now offers you choice between high damage per one shot/hit or high survivability and very good "team" skills.