This is the best historic series I have seen after Ertugrul Gazi. This makes me proud of my Islamic history. I would recommend you that if you watch this series do not compare it with Ertugrul Gazi series as you will not enjoy. Both have there own charm. Just enjoy it and don't learn history with it as its just based on Osman Gazi's life. Its not a documentary, its a series so there is some fiction.
Over all enjoyable but with eng subs as watching with original language makes it much more interesting.
I am rating five.