Just defeated my first Ninja HQ, yes I cheated, I basically skipped the last two phases. Overall didn't think it was fun, just obnoxiously difficult.
I think if I fought it again id use 2 Tanks 60mm Autocannon (HVAP) because the hell grenade packs came in handy. What I used was one tank and a Bombard with Hell Shells and used it to blow away the autocannon turrets and many of the ninjas past the main defense (also weakened the tank traps so they could be blown a path through by the tank).
Overall I just felt there was a hell of alot of cheese with the medics and assassins, like come on is there yet Another one huh. Those things should've all been downstairs.
Im supremely disappointed that the barricade structure walls couldn't be blown through to make holes. That's a key feature of my tactics. I make doors.
I had 5 Gals in power armour, maybe 2 in Revenant. And 1 gal in a Grav Harness armed with a super shotgun (who scored many of the kills). Most of them had precision weapons like Precision Laser and Custom Sniping Gun. I should have brought more plasma pistols to deal with shields though and wasn't expecting that. The EMP grenades I brought didn't do anything to the mini gun turrets though, could be I didn't get them close enough or something.