I believe that what we are all saying is simply put "choices".
The more choices we have, the better the game.
Different approaches for the same situation, a variety of side quests to solve, numerous weapons to choose, various mercs to hire.
Even destructible terrain falls easily in "choices" as it gives you a different option in solving a problem.
Apart from that, though, I kind of lean on the TB tactical fights vs the Real-time. I have reached 50 waiting for a proper JA3 and my reflexes on stopping the game or even realizing what's happening on the screen, especially when I am trying to flank using more than one team, are not what they used to be.
Thanx