Issue is they just completely shit the bed with it. No Battle of Chi Bi/Red Cliffs? For someone who grew up playing a fair bit of Dynasty Warriors having one of the iconic battles of that game and the actual time period missing was a gut punch. I already mentioned the issues with recruiting units and the battle balance, and only later I realized the entire way generals were set up, especially with their skills, was an absolute clusterfuck of complication. Some bonuses affect just retinues, others the army, others specific units in their retinues, and it was just a massive overcomplication. Like yeah, Guan Yu wasn't going to have his guys learn how to fight from Zhang Fei or vice-versa. Strategists were absolutely worthless in the field but you didn't get artillery or non-shit archers without them, etc. Oh, and reforms were locked behind a universal time gate for the Han factions. Not a lot of reason to build schools when aside from Empire and Napoleon this may be the most essential time period to tie teching to schools given how wedded-at-the-hip education and the bureaucracy were.
They absolutely nailed the diplomacy and rivalry stuff, and the family tree and the Imperium stuff was good, but god damn. They fucked up so much other stuff. At least we were spared the indignity of mammoth skull cyclopes.