Buffed up Lords become literal Damage Sponges later on. If you stack a decent amount of Meele Defence and Armor onto one, they will take an INCREDIBLE amount of punishment before going down.
I think the general "Lord Balance" is a bit whack at the moment. Grimgor is a very angry, green mass murderer right out of the gate. While Azhag has to hide like a little girl in most fights because he tanks like a wet tissue and hits like blind stuntie without arms. Maybe its to make up for the fact that later Azhag get's to ride a Mount and cast.
Same goes for Mannfred vs Kemmler. The former plows trough entire stacks without breaking a nail, while the latter usually get's a comfy seat somewhere behind the lines and cast something occasionally.
The AI also carried over some bad habits from previous TW games. Greenskins vs Dwarves is supposed to be an obvious Quantity vs Quality game. But the AI controlled Dwarves seem to conjure money literally out of the ther to sustain same sized armies as me. Once you border on multiple Dwarv Factions, you have to deal with full stacks of bearded murderers every couple turns, with barely a moment of respite. It's sad that only Chaos get's the Horde mechanic. I'd actually like it if you could opt to not bother holding stuff with Greenskins and instead focus on raiding/sacking.
Don't take that as a really bad point tough. The battles that I got out of the game are beyond entertaining, they nailed the atmosphere pretty well. And the game is just... surprisingly good in general, considering we're talking about CA here.