In my opinion the chariots are the most devastating unit in the game!!! They are weak against Hoplites, but other than that they are amazing. If they are used against any infantry they absolutely destroy them. I play the game on legendary and regularly they win battles for me with some chariot units logging 200 kills. The chariots are also a very fast moving unit. I mostly use them to break enemy lines and quickly kill any unit that utilizes projectiles (bowman, archers, slingers etc). There is a reason chariots cost so much.
If you have a really experienced general and the units have enough XP/upgraded armor you can even take a couple units of chariots and charge a Hoplite unit staright on. I think the best way to use the units it to have about three chariot units and 3 cavalry units to support them. Try this strategy and you'll be amazed!
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