When it comes to summoned monsters, perhaps part of the problem here is that so few of the summoned creatures require upkeep or supplies. Without upkeep or supplies to worry about, the only limit to the amount of magical troops you can summon is your gem income and the availability of mages.
What if summoned units required an upkeep in gems? While we're at it, how about the same for global and long-Lasting local enchantments? That would make it much more difficult to use summoned monsters as the core of your armies.
On the topic of Super Combatants, I don't have enough MP experience yet to know how bad it really is out there.
But from what I read on this forum, when people are complaining about SCs being too powerful, what they are really talking about always seems to be Vampire Queens. So is this really just an aspect of the VQ issue? Or is she just the worst offender?