REALLY. To me at least.
I know it's somewhat trendy to hate on Glee these days (not referring to you Charlie tho cause I know you watch/watched it), but people tend to disregard their covers as sh!t only because they are covers and because it is Glee. Imo, the versions they've made of Broadway classics are brilliant, which are the ones I listen to the most. The pop covers, with the exception of a few of the mash ups, are nothing special, but I wouldn't call them sh!t either. Nothing that comes out of the mouth of Lea Michele, Amber Riley or Naya Rivera can ever be sh!t. 
Don't put me in that category, because you have no idea what I really think. I only dislike the music because I haven't heard many of their covers that are good. I'm sure the Broadway tracks are good, but you'll just have to point me in the direction of one. Lea Michele is a great singer though, I've heard her and she is really good.