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The biggest drawback is the slow pace.
If you play strategically, it becomes very slow.
For me, there has always been one approach; I hardly noticed any difference in the units' properties, except for the obvious and truly useful ones. With large armies, the game felt quite boring. The more I played, the more boring it became. I only completed "The Restoration of Erathia."
The most unpleasant drawback is the excessive predictability and, in my opinion, monotony.
Please don't bombard me with curses.