Somehow I doubt Fukuda did not enjoy making these films, as he has made among the most unique and fun films (in my opinion) of the Showa era. He may have been very critical of his work (many artists are), but I believe he definitely had a good time making them
My list:
1. Godzilla vs MechaGodzilla
2. Godzilla Vs Gigan
3. Godzilla Vs The Sea Monster
4. Son of Godzilla
5. Godzilla Vs Megalon