IMO they have become weaker over the past few patches. Mamluks seems to be stronger this patch and Austria is gets their PU's a lot more often, with the attitude changing when they have a subjugate PU(which was an amazingly good change).
Ottomans have gone downhill ever since CoC when the Devs buffed Mamluks into the stratosphere and game the Ottomans close to nothing in return.
More recently there have been multiple buffs to Poland, Hungary and Austria as well which indirectly nerds the Ottos. And they also got hit pretty hard with the new Merc system.
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