Defenately a 10!
SSII has a big placein my heart, not just for been so grand, because the game is just that enormous, you feel like the game just takes you there, the stages are so regal and intense that your trapped, and the music is just phenomenal!
I agree with the SSIII comment is a gorgeous game, very atmospherical indeed, and has a better use of the buttons than SSII, but it doesn't have the charm, I'm first in line when it comes to defend SSIII, back in the day before SSV & Special, everyone belittled SSIII, but I was there at the frontline!
SSII is one of the best SNK games ever, my only gripe with it which is minimal is not having the button scheme from SSIII.