Originally Posted by
mysticx
It became a sort of arms race, the Horde does all the super weapons, so Alliance heroes have to be more powerful (Because Blizzard can't write "Outsmarting", or "Seeing the obvious thing coming"), which requires yet more powerful weapons (And contrived stupidity) to compensate.
Most of the stupid stuff Jaina did in the battle for Undercity was pretty much required because Anduin insisted on waddling into Plague central without any countermeasures, Gnomish hazmat-suits (If any race her experience with that stuff, it's the "Let's gas our own city!"-gnomes) would have made more sense, and not have bloated Jaina's power level to stupid heights.
So it's a full on arms race, simply because Blizzard writers are madly in love with the "Rule of cool", to the exclusion of literally any other consideration.
The story would be greatly improved by more subtle writing, and less reliance on incredibly powerful characters.