D. SNES could very well be the worst.
V is great but IV and VI are boring.
Pretty much everything I could hate from a ranking: X on top, the NES games AND VIII on the bottom.
I'd have to say
PS1 (all three are unique and great)
NES (II is kinda weak, but the first and third are among the best)
PS2 (rivals the NES, again X is a little weak, but XI is great so far and if XII holds up on a replay it might beat the NES)
SNES (I really love V, but it's just brought down by the story-heavy but boring IV and VI)
PS3? (Haven't played XIII, and XIV will probably bring this down forever. we'll see if XV comes out in time)