Actually, total Warhammer 2 is a pretty significant improvement - particularly in its own campaign, versus the big ‘multi-game’ one.
The races are, for the most part, like the DLC races from the first one, i.e. actually interesting. The Skaven with their corruption that increasingly hurts themselves but also allows them to summon more and more units anywhere on the battlefield in corrupt areas, crawling from the ground. Not to mention their hidden cities.
The lizardmen with their enormous dinosaurs that are hugely powerful but cannot be controlled - instead, needing to be deployed ‘at the right moment’ and the chaos exploited.
The campaign mechanic with the massive attacks once you’ve captured the next objective (related to how that campaign works, capturing power points), meaning that being the most powerful often puts you in the position of being the weakest, as you’re ahead on the global objectives and have large buffs but have been ground down by huge chaos attacks. It creates this rhythm of unsustainable but powerful defense, then struggling offense as you marshal your stragglers and go on the attack.
There’s a lot to be said for it, essentially.