I mean right from the start when they sang How Will I Know, my eyes got watery... and don't even get me started on Kurt's performance of I Have Nothing. The line up of songs they chose was really great. My least favorite song was actually I Want To Dance With Somebody, I was just not feeling their version of the song, although it's definitely one of my favorite Whitney songs.
The only problem I have with Glee still after three seasons is their lack of a good story line at time. They try to tie a bunch of songs together and that often makes the story lines unbelievable or practically non existant.
Also this song will always remind me of dance class, because I had one teacher who always used it as one of our warm up songs.