It gets a little harder later on as their unit diversity and warband size gets bigger. But the formula essentially stays the same.
Hm, it seems this review from Rock Paper Shotgun in 2015 was spot on.
It's got the right of it, but I'd argue about character diversity. There are obvious things to build for and Mordheim's selection of active/passive skills leave
a lot to be desired. To the point I had two or three duplicate characters in my warband.
But yeah, the AI is essentially difficult only if you're trying to play the game as if you were playing Mordehim on the table top. As soon as that big team fight starts, the game is more or less over, it's just a matter of whether you will lose any guys or take any injuries. If you can manage to circle all the way around to their wagon without getting their attention, yeah, you can just cripple them right there. (Rarely managed do that because one of their hero units always comes sprinting directly at me because it psychically knows where I am and has a ridiculous amount of Strategic Points. Then the rest of the AI goes "oh they're over there" and starts making their way toward you, except for the odd duck who just climbs up then down then up again on the same spot of terrain.)
The AI doesn't value wyrdstone except as an afterthought, it doesn't care about its wagon and it certainly doesn't care about its guys. Which is ultimately why the game cannot play out in SP like it does on the table top against a human player, or even give you a convincing facsimile of it.
Frankly, I blame the multiplayer. I get why it's important but I don't want to play people on the internet, I wanna play a satisfying SP game. And I think because of the MP component they essentially said "fuck it we did we the best we could" with the AI instead of solving it, because in the end they made the game for MP and the SP and the story, despite how extensive they are, weren't really their priority or the thing they thought would sell the game. I think the game might actually be kinda brilliant in MP because humans care about shit an AI does not and there are zillions of options of how to play it against a human....but I'll never know.