This isn't particularly tactical. The AI is using the *same* tactic over and over again--rush the back line. Rush the back line. Rush the back line. I did adapt--I got through the area, eventually. It's a hard tactic to deal with--it is basically designed to **** me--but it's also *EXTREMELY* predictable. The Mercenary Beserker will *ALWAYS* jump over the tank, knocking him prone, and attack my back line. The Mercenary Warrior will *always* break engagement and rush the back line. It's not an "occasional" thing, it's not a "sometimes" thing. It's an entirely predictable event that you can depend on, and therefor manipulate.
The complaint before was that you always were doing the same things over and over again? You still are. It's just a longer, more complicated sequence.
When one move is superior, you'll always chose that one. This doens't make it "not tactical". Tactical doesn't mean a player randomises over inferior strategies. Just think about how another human players would fight your party. There'd be no uselessly hitting your indestructable fighters whilst the Ciphers and the Mage annihilate everyone.
Now, as I've said before, the AI employing optimal tactics doesn't necessarily make the game more enjoyable to play.