IMO it's one of his top 10 songs, it has that classic feel of Lose Yourself, SFTM, Way I Am, and Cleaning Out My Closet. Not putting it on an album is one of his worst choices. It's so heartfelt and it just the epitome of what Eminem stands for (well, stood at least stood for).
It bugs me that it's just a bonus on a soundtrack, relegated to being listened to by mostly Stans.