I'm playing my first Campaign right now and...
- Darkshards are so freaking OP....you can kill *any* high end unit with them. They are basically thunderers, but better and are t1 units.
- The Black Ark is weird to use. You can't attack with it, and you can't reinforce it if you aren't @ sea yourself. That means you need to guard it with a full stack, pref. elite units, because auto-resolve favor elite units about 4-1 now. Costs like 4k to maintain like a normal army (because you need to cover for it), but you can't use it like a normal army. It's obviously amazing if you can get it to work... but as I mentioned, it's super clunky.
- It's pretty hard to play a "co-op" campaign right now too.
- Trade routes are destroyed by bigger rivers. You can't trade with the eastern Dark Elf factions as Cult of Pleasure due to the river, even though you can move over them. You need a port first.
Other than that, the game has improved a lot