:salam2:
First of all, singing or listening to nasheeds are not a prescribed act of worship. It may draw you closer to Allah(swt) however there are many other better ways to do so. For instance reading and understanding the Holy Qur'an, praying salah, learning and making dua'a and so forth.
As you've said, nasheeds are becoming very mainstream and glamourised in the same way music is, even more so when musical instruments(which are haram) are used.
There is nothing wrong with nasheeds as long as they don't pass the boundaries set by Islam. However, this does not mean you should waste all your time listening to them; listening to Quran is much more better.