Yeah... BUT... there are some huge advantages to using just normal unit sizes (so that an infantry unit is 80 men) in the Rome 1/Med 2 engine:
1. Pathfinding for both AI and player is much better and much smoother.
2. Sieges don't take an hour. When units fight in the streets, no flanking maneouvres, large or huge unit sizes means it takes FOREVER for a winner to emerge.
3. Way better frame rates (though this shouldn't be an issue for most gamers as we have better PC's than we did when these games came out 10 and 6 years ago.
Furthermore, I'm convinced the battle AI is better when unit sizes are on medium. Especially in sieges. It performs better. You're still going to win because it's the Total War AI and it's not very good if we're honest, but I'm sure it does better when medium unit sizes are on. I agree however that huge unit sizes does feel more realistic and is obviously more fun/satisfying to watch during a battle. But then, when you're playing a game where the Roman AI's are creating full armies of Pedites Extraordinarii in the year 269 BC, is historical accuracy really such a concern?
Bookmarks