You are absolutely right for the ranking from place 3 to 7. Imho, place 1 is for Metal Gear 2 Solid Snake (1990, MSX) and Place 2 is for Metal Gear (1987, MSX). Played both in my childhood and replayed them recently on PS3.
Discussion
I never played the two earlier ones but I know how powerful games from there era where as they couldn’t lean on graphics as a crutch. I still consider Mega Man X to be my favorite game, at least my most fondly remembered.