Janissary Musketters are actually the best gunmen in the M2TW game, as if they had no more ammo, they just drew their swords and charge forward to act as decent medium infantry (seriously). You can expect the same with Russian Cossack musketters.

But it looks like in empire TW: the Ottomans didn't have these excellent men, and Janissary musketters are quick to die in melee....