Oh god, don't remind me. I still have nightmares about Warband's beyond terrible reinforcement and tactics system. I guess this is rather subjective, but I absolutely abhor tactics in Warband. Due to high tier units being so much stronger than lower tiers and high surgery skill being so much more impactful (you could reach something ridiculous like 96% survival rate with 10+4 surgery iirc) in conjunction with braindead enemy AI, having higher tactics just made battles last longer.In Warband the Tactics skill gave you bonuses to troop spawning. The higher Tactics you had, the more troop ratio you could have at the start of the battle than your opponent
I do understand that giving troops some +x% bonuses in the tactics tree isn't the most exciting thing either, though it's probably due to my limited imagination and far better things could be done with tactics.