S: Consoles I associate with my favorite games of all time and most treasured moments with games.
A: Consoles that have solid libraries, with plenty of games I like to pop in on good occasion.
B: Consoles with a good chunk of great games, but I am less compelled to revisit compared to the libraries from the consoles above.
C: Consoles with flaws that bother me personally (PS3 and Wii U UIs feel slow, PS3 and N64 controllers feel meh) that make me less likely to play something on these consoles. Still has good games, but most of the ones I care about can be played on other platforms.