Charna is the best!
If you have ranged units, upgrade the Sorceresses, improve your tactics, and break through. Besides, Sorceresses are the main offensive unit in the early days, until you have enough Knights.
But overall, yes, it's very sad. It's the weakest castle for breaking through in the first week. It's hard to defend against a rush. It's hard to take serious resource nodes.
Personally, I would eliminate it myself, without waiting for the opponent to do it.