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If you haven't touched the Economy and other aspects, it won't be difficult to form an opinion. I'll take a look tomorrow when I have a moment. (It's a pity you can't see the creatures here – their stats and abilities. It would make things easier.) 🙄
Added 40 minutes later
Okay. Let's start:
1) In terms of stats, all units are identical to the vanilla versions, but they've added even more stats on top (it's not entirely clear why?).
2) Landlords are definitely an overkill. Not only have they already buffed their damage and attack, but they also have "Charge" (like the Lizardmen from the League). Give them any speed buff (so it's 5) and it's essentially a guaranteed armor ignore. Considering this is Tier 1 and a small creature.
*In general, if the Mod doesn't plan to introduce "special" Neutrals that need to ignore Armor, then the Landlords' ability is excessive.
Further balance follows the principle: the higher the tier, the better. (By the way, you didn't touch their "strength" or the experience they gain, even though it's obvious that they are just enhanced versions of the vanilla ones.)
T1) Terrifying. Playing "as" them will be fun; we run around and one-shot Tier 7 mobs. Elaine is happy. Playing "against" them is "not fun" – a randomly morale-boosted group of Landlords can run up and one-shot almost any stack.
T2) Okay.
T3) After the previous ones, its ability sounds like a joke.
T4) It's okay, but I think the unit description doesn't correctly explain its skill. From reading it, it seemed like you gave them "Frenzy" or something similar. But in practice, it's a "Cleave" ability. (I read the descriptions before looking at the skills and stats.)
T5) It's okay, but giving Berserk to the Priests? They can be split up. Berserk depends only on skill (duration), and the spell affects the bonus damage. So, you can split the Priests into 7 stacks and calculate how many "free" Berserks that will be per battle. If your opponents aren't Undead, that's scary.
T6) Okay, a situational enhancement of their basic functionality.
T7) Well, they're clearly not on par with my angels with "Strike from Above." Although you've given them a lot of stats. It's almost as if the Hero had a couple of powerful artifacts on top (compared to the vanilla versions).
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In general, you've essentially added a kind of 3rd Grade. Which is just stronger than the Red versions (except perhaps the Zealots). And the Landlords sound really scary.
Since this mod is designed specifically for a PvE Campaign, all further questions depend on the specifics of the Campaign itself. Who will have them (Player/opponent), what will be the intended gameplay of the missions, and so on.