So I just finished the Campaign and I have to say it was about what I expected, as in kinda boring. D+. I know this probably isn't a priority but some relatively small changes would make a big difference in making the campaign much more interesting to and fun to play. If the campaign is a as is kinda thing then still when either Stardock or Modders add more scenarios here are some ways to improve on the current campaign.
The Good:
-Interesting Lore.
-Lovely Paintings.
-Plenty of Items.
-Leveling Champions.
-Lots of Monsters.
-Side quests.
The Bad:
-No real building but it's tacked on anyway.
-Too many champions.
-Lots of pointless turn ending.
-Lack of choices or strategies.
-Walking everywhere and then walking around some more
-Lack of real boss fights.
First of all you just spend way to many turns walking around. I suggest doubling the movement rate on terrain and removing the rough terrain penalties. There is no reason to have the same movement rate as in sandbox games, it gets annoying fast. I also suggest adding the movement boosting spell to the tech tree and adding in more mounts. Also re-adding the old town portal spell couldn't hurt. You shouldn't be forcing players to waste 100 turns walking around.
The second big issue is the champions, and how they remove strategic depth. Cap the total amount of champions allowed in a group at 3. This way players will use normal troops, make more then one army, and have to actually think sometimes instead running everything over with a huge champion stack.That bored me to tears. Autocalc, autocalc, autocalc...
Thirdly there is the weak enemies. They are simply to static and weak. Why so few enemy champions. Please please add way more smack talking enemy champions with tons of spells and abilities and high armor values. This would add a lot to the scenario. You could even have a few duels. Also more boss fights are really needed, and need to be done better. Bosses should have tons and tons of hp and cool abilities. That last Demon should have been laughing at my blows, casting ranged damage spells, summoning more lurks, and trying to get a huge mass damage spell like horrific wail past my counters. Instead it was just another demon to stab. I'm not saying they have to be impossible to beat, just that they should last awhile and be interesting. Also when it gets to the last mission some of the enemy troops need to be using platemail. You will have it so they also need it, it makes no sense for the enemy troops to never have anything better then leather.
Fourthly there is the vestigial resource system. Admittedly what I suggest here isn't so small of a change. The biggest problem here is the resource system, it makes no sense to gain constant resources over time and yet not spend resources constantly over time. Get rid of all the mines near your starting positions. Instead add special quest mines spotted across the landscape. You would gain resources by walking on these special locations whereupon you would face a repeatable random encounter which would reward you with resources when you win. This way champions and armies become the the main way to gain resources instead of time, which is broken in a scenario where you don't have real enemies or building. Also please switch all the campaign cities to having only 1 essence. That way you face real choices in enchanting. A similar system could work for mana, you basically get endless amounts of it as of now. The land should be spotted with shards, which would be guarded by elementals or dark wizards but when liberated by a player grant a substantial one time mana reward, and a very low over time amount. Shards are such a huge part of the lore so why are they so neglected in the campaign?
Fifthly here are some larger changes. Re-add pioneers and make a few more spots settleable. It can't hurt and it would really help make you seem like your building a true kingdom. More cities will just help you defeat enemies sooner and travel easier. Also as stated above enemies are too static. Why are there no enemy cities. It would be nice at least once face an enemy that adapts to you and be able to fail... At least have some monster lairs or forts that spawn wanderers.