If there is less politics/diplomacy/strategy and the AI is still shit tactic-wise, its gonna be a hack&slash borefest even with the "better" sieges fingers crossed the claims are not overblown like in all the previous TW titles.
Regarding battle AI, so far from what I've seen only 1 or 2 youtubers each had a single incident where AI went to retard town, but they were both surprised so it's possible those were just glitches. They may be not playing the final version however
And from what I saw, there are only less politics if you're orcs or chaos, with orcs mostly doing peace/war and confederations, and Chaos "freeing" the mortals from their feeble minds into the open arms of Chaos!
Diplomacy looked nice, AI gives YOU offers sometimes, like trade and what not. Something between Rome2/Attila level of "NO NEVER" and Shogun 2 level of "take my 5 regions for this trade deal"
Strategy, I think I saw Legendoftotalwar struggling and having to sign a peace with orcs (playing as Dwarves) because he was having issues. And if Legend has issues on strategy map, then AI may not be all that retarded
Anyhow, Chaos is the Attila of that game, and they can really wreck your shit if you aren't careful.