We do have records of Ottomans taking firstborns and taking them back to Ottoman empire to be raised as Ottomans

The devshirme had nothing to do with specifically taking the firstborn. They took 1 among 40 children in a village. You guys are also blowing this out of proportion. It affected a tiny fraction of the christian population. Not that you cant and shouldnt criticize it, but the entire thing ended in the 1640th. There is an entire \~250 years after that, which is brushed off.

And if this is your "main argument" in a comparision to the Roman Empire, then I understand you even less. The millions of slaves, the genocides and the human meat grinders for Roman emperors were better because?

to commit atrocities against their own families and nation.

You made that up. The Janissaries were stationed in Constantinople. They were not stationed, where they originated from. They were also self-aware and many were known to be great benefactors of their people. E.g.:

"Although Sokullu became a Muslim, he remembered his Serbian Orthodox roots and family. He persuaded the Sultan to restore the Serbian Patriarchate of Peć as a "gesture of reconciliation".^([6])"

https://en.wikipedia.org/wiki/Sokollu_Mehmed_Pasha

This was an essential step in the preservation of the serbian church.

But when comparing Romans and Ottomans in the Balkans both were horrible.

Scale buddy. The Romans were by far more destructive. Many of Mimar Sinan's work are on the Balkan. The Ottomans built and repopulated cities on the Balkan. They built public buildings all across the Balkan. A small portion of it is left, because most of the otttoman stuff was deliberately purged out of existence by orthodox nationalists.

And in a time of war and destruction, the Balkan stayed relatively speaking peaceful for centuries. Again: This doesnt mean that there is nothing to criticize or that you should be thankful, but there is more to the entire topic than just "they shit".