Insofar as the carrot of EU membership has forced Turkey to moderate its policies on Kurds, Turkish-occupied Cyprus, and free speech issues, I suppose it's a good thing.
However, that doesn't mean they are moving in the right direction.
The only barrier to Islamic supremacy, i.e. the military, is slowly being hollowed out, and its role diminished, which is why I don't think you can seriously consider that nation a reliable ally in the future.
Couple that with the millions of home-grown Islamist Turks living and plotting in Germany and you have the seeds of Europe's undoing.
Thought you knew that.