Purebreed: The old Rainbow games pre-planning and how the mission were exectued were great.
Oh yeah, unto itself it was definitely very well done and something I wish we could have seen a more competent developer preserve.
But you see, that's not at all tactical by itself. No, it really is not. As Field Marshall Helmuth Blah Blah Longassname once said "No battle plan survives contact with the enemy".
Unless that plan was devised in R6 in which case it will be followed to the death if need be.
You need to be able to adapt on the fly. Given that by planning the mission you're actually doing the closest thing to programming the AI the game will ever have, that's not possible. They won't deviate from the plan even when they're getting shot at from behind. They just carry on trundling forwards to their deaths.
There's nothing tactical about that.