I agree. Free never reached the heights they deserved, and maybe All Right Now contributed to that. That wasn't their standard style, but people expected repeats of it.
They were very young, and the pressures got to them, especially Kossoff and the drugs. They split up, then reformed to help Koss, but then fell apart during the recording of their final album, Heartbreaker, which is incredibly good considering how it was recorded. Kossoff was incapable of playing half the time, and Fraser left again, so how it came out so good is amazing.
Rodgers and Kirke went onto much bigger fame, but they never came close to Free for me.
The sounds made by Kossoff and Fraser were unique.