Out of the consoles I have personally owned:
S-rank: My all-time favorite systems, which most of my all-time favorite games are on.
A-rank: Not quite my favorites, but still great systems with outstanding libraries.
B-rank: Solid systems with great games, but still too new for me to get nostalgic over.
C-rank: Systems I only owned for a small handful of games each, but each one did have at least one or two titles I'd consider among my all-time favorites.
Out of all consoles I've owned