A 10, hands-down (no pun intended). I got my Jitsu action figure for Christmas back in 1984. I thought he looked suitably wicked. Mattel did a really good job with the figure's head and oriental-style armor. I thought the orange katana packaged with the figure was neat, too. It showed that somebody put a degree of effort into making Jitsu a memorable character.
I can see why Filmation wanted to avoid racial stereotyping, but it's still a shame we didn't see Jitsu in more episodes. There was a lot of missed potential with that character.