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Note: you are contradicting yourself in these two sentences. Believe me, a banally designed plot, no matter how colorful, will always be as "appealing" (or rather, consumed?) as a super-duper plot (which doesn't even need colorful design, as it's already captivating).
And I repeat: if the city of Forge had been introduced initially, at the same time as Rampart and Necropolis (in the third game), or even in the first Heroes game, neither you nor I would be complaining that this city doesn't fit into the structure of the Heroes world; instead, we would be playing and arguing: which 6th-level creature is scarier :).