Reptile is one of my favorite MK characters, but I hate how he got absolutely shit on in MK9's story.
Both he and Baraka were portrayed as just your typical disposable henchmen. Both also deserve much better than how they are normally treated.
What I like about Reptile the most is how he and his ultimate goal of restoring his dead race of Raptors are well-meaning, but his means of achieving that goal are less than honorable. His ultimate desire ironically is the main culprit behind the depth of the corruption of his soul, as he allows it to consume him. His already animalistic state of mind is deteriorating, contributing even further to his desperation in obtaining his desire. He'd do just about anything if it could lead to reviving his race. Reptile is a troubled soul, teetering on the edge of utter insanity as he strives to do what could be the impossible, bringing back the dead.
Although with that said, this aspect of his has been used so much during the course of the MK series that it's starting to become very repetitive. Reptile's story suffers from the same problem as Scorpion's, while their backstories are great, their current stories are stagnant and haven't progressed at all beyond what's been established. Reptile's still serving the Big Bad in hopes of reviving his race, Scorpion's still trying to get revenge on the one who slayed his family and clan. So, eventually, things are going to have to change. This is why I hope that Khameleon returns in the new timeline, so that Reptile's story will start to actually get somewhere and so that his character development can really start