hiul said:
i dont mind if they use that big crossbow ballista but it will be better if they improve/change it to the real one though (as i mention i dont know much about siege engine, so i dont know is that big crosbow ballista may actually exist in real life or not).
the classic ballista could be quite big and throw big rocks, but at the game timeframe with the mangonel and trebuchet it wouldn't be in use. The smaller ones (anti-personal) would, the ones for spears/darts. If you visit a source like Wikipedia you will notice they are quite bad as a reference, they mix names and pictures for weapons like the scorpio and ballista, and the earlier greek versions.
Wikipedia pics
^ huge ballista (pre mangonel), not in the game
^ small ballista
older versions like the crossbow like version (has it own name Gastraphete), that could be mounted similar to the one in the game
Web has conflicting pictures for similar weapons. A complication of ancient designs, lack of historical references, and the variety used on different nations and centuries.
they could had used the Roman version for this weapon (small ballista with springs), but not a big deal IMO. The biggest issue with the game model is if it does too much wall damage, it would work better as a anti siege weapon (burn towers) and anti-personal (kill soldiers no matter if they have armor and shield).