TLJ: from a technical film POV this movie was actually great. Strong cinematography, interesting twists in the script and overall good acting and pacing. The issue is that it was a very bad "star wars" movie. A lot of fans felt it didn't do the traditional Star Wars characters and story justice. I agree with both critics and fans.
TGS: It didn't win an oscar for best song, it was nominated. Regardless of that, best song is not usually considered a top category in the Oscar's from a film critic POV. That would be best movie, director, script, actor/actress.