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I tried Rupert on a Barbarian. It was a complete joke! In my opinion, it's an absolutely useless race with its counterattack; on this map, the specialization is useless. What second specialization are we talking about? The Ballista, yes, 3 shots are cool! The first Demon won on week 3; he had upgraded machines that immediately destroyed the gates, and his ballista buried half of my army. Now that's what I call a specialization!)))) I even lasted longer playing as Dwarves. When I played as Barbarians, there were no attacks at all; they didn't even dare.
Of course, everyone has their own tactics and playing style. I'm not imposing my opinion on anyone.