Total War factions vs. Lord of the Rings factions?

I believe Gimli was one of the "better" dwarves at close combat lets say. Don't think all of them are that good, if they were why was the battle of the five armies in hobbit such a close run thing?

It may have taken trolls wielding a rather large (and magical) battering ram, but TW has culverins and cannons!

Let's assume they mesh, that way the Dwarves get their ancestral homes and the Total War armies get Constantinople and such.

Yeah, but I bet the crack guards that man the Dwarven ancestral homes are as good or better than Gimli. Constant warfare between them and the goblins, orcs, trolls and other beasties of the deep would make them the best of the best.

I think the Dwarves at that battle were a bit bad.... Besides it was for children, had to be close or there would be no big climax after Smaug. Also three way battles are a horrible meat grinder. Who knows if the dwarves were in the middle or butchered both sides at once with neither the elves or the goblins fighting each other much at all?