I am seeing something of a contradiction there. I agree with your observations, but find the WRE campaign can be fun if you adopt a "no conquest" policy. Don't take any settlements beyond your frontier. That allows the non-horde barbarians to be grow and be a pain. Re-unification can be a long term aim, although again I don't start that fight.
You might want to try the God mod for some extra detail and flavour, although to be honest it makes things even easier for WRE as they soon start to roll in cash.
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