Ottomans are fine in the early stages of the game, it was a huge empire and it did win against the hungarians, poles and austrians, plus having been standing twice before vienna.
The issue though is that the desaster, the turning point of the empire is never adressed. The ottomans lost much momentum after their second loss before vienna and where pushed back time and time again loosing on all sides but Sudan and north aftica. The direct control of hungary was soon lost and of southern ucraine and crimea.
There should be an event with missions or withouth where one needs to stilize the land or there would be destasters like rise of the janischars, infefficient administration, religious tensions, a third of the total population was christian. Nationalism with supressed minorities, etc...
I think the age of absolutism would work best for this desaster, and one could link it with the spawing of cores for greece, armenia and other nations.