While I don't really mind devolved lizard Reptile (you gotta admit he did look badass in MK4), I do miss him terribly as a ninja. Take a look at my icon! The green ninja is long overdue for an encoure.
That said, I think with where they left off with him in Deception, they have a perfect opportunity to bring back Reptile in the ol' ninja garb. Look at Sindel's ending, second image in the bottom lefthand corner... :twisted: