Vantaggi
Few decent people left to work with, if you have the chance the work with them take it! But the moment they leave be sure you were good enough that they take you with them. The benefits used to be good, but after the merger with Türk Telekom the standard has fallen dramatically.
Svantaggi
The company is constantly struggling within itself rather than competitors. High level executives care more about taking down other execs rather than improving the work quality. Changing departments and finding a right fit for yourself is out of the question with ego-driven managers. Asskissing is of outmost value, doing your job is important but efficiency is frowned upon. Not even going to talk about the religious pressure. The ability to innovate just does not exist, only capable of copying what competitors are doing. Personally witnessed a good and innovative idea being burned to the ground, later when the same idea was implemented by a competitor managers had the "decency" to scold their "underlings" as incompetent and not able to think.