Well yes, there are far too many Mandalorians in the eras of the PT and post-OT, more than there should've been after the Wars. But think of it this way: a constant struggle against an implacable foe, constantly going from battle to battle with scant time to breathe, bonding over shared hardships and successes, and finding out that the whole is greater than the sum of its parts. It would focus on one Republic warship and its crew, and you would never really see the Mandos except in their ships and fighters, or as amorphous enemies in ground battles. No ballyhoo about honor in battle, a glorious warrior death, or any of that bollocks; you could even get away with having no Jedi aboard to muddy the waters with Force-inspired yammering. It would be awesome.