While that is probaböy true, why not have them there as harder countries to play for those who want more of a challenge? And it's not purely random countries either as all of them were involved in these wars and I've seen several other Napoleonic wargames that include these countries as well.
They would be fun to play as a challenge but they should at least have different goals than the other great powers who the napoleonic wars revolved around, for example Ottomans becoming the land/naval dominating nation is simply impossible, even if the player manages to overthrow the jannisaries who cripple the empire; Its not just because Ottomans were too weak to challenge anyone, but also because the napoleonic wars werent the main concern for the Ottomans, maybe rather their loss of Egypt or the Serbian rebellion, or even Persia.