So yeah, I just watched Gamera: Super Monster, very cheesy and filled with stock footage, plus it was a lame way for Gamera to bit the dust. Oh well, here is how I rank the Daiei kaiju movies (putting the Daimajon trilogy in here too 'cause it is just that small):
Wrath of Daimajin > Advent Legion > Guardian of The Universe > Daimajin > The Brave > Vs. Barugon > Return of Daimajin > Vs. Gyaos > Super Monster > Vs. Guiron > The Invincible > Revenge of Iris > Vs. Zigra > Vs. Jiger > Vs. Viras