some are annoying, some aren't.

some clones in super smash bros are just annoying because they're so similar. like someone said, the mario and link clones are too similar and there's enough other characters as it is.

Mortal Kombat did it right. All characters have the same punches and kicks, but the super attacks of Scorpion, Sub-Zero and Reptile makes them as different as Baraka and Johnny Cage.

Tekken. Kunimitsu was pretty useless, it's just Yoshimitsu without his best attacks.