Seriously? Deception began with having many familiar characters KILLED OFF SCREEN, then gave us a surrogate protagonist who was bland and forgettable. The game shoved Shujinko down everyone's throats just because the studio arbitrarily decided that the crucial elements of the plot would all happen from his perspective. Really guys, if he's so important then why didn't you even bother giving him a unique move set?
Midway also decided to throw in the original protagonist for old time's sake, but now he's a zombie! Wow guys, inspired stuff. The new characters that were introduced; Darrius, Dairou, Ashrah, Havik, Hotaru, Kobra, Kira, all of them an embarrassment.
I realise that there are some who believe Havik and Hotaru have potential. Well hey that's a possibility but it sure as hell wasn't fulfilled in MKD or MKA. They might as well have given us characters from Black Realm and White Realm, or Dog Realm and Cat Realm. That ain't good writing. That's lazy af.
Yes, seriously. That's what I think.
Mortal Kombat could have gone into the Street Fighter way of repeating the same story forever. But they decided to go forward. Instead of forgetting the arcade times, as it could have happened, they preserved that and continued the franchise on the same timeline and plot.
What's the matter of familiar characters killed off screen? I didn't care at all about that. The fight that matters is Raiden vs Shang Tsung + Quan Chi. I like Shujinko, and most of all, I like Onaga. IMO, the plot was very well written, because they found a way of going though all the games through a deception. Shujinko was fun, I enjoyed him, I didn't care if he had unique move set or not, what matters for me was the story, gameplay is just a way of fulfilling it for me.
Liu Kang's death IMO was the best sign of the loss of hope. They killed our hero and made him come back as everything we would never imagine, and worst than that, a maniac homicidal. They took our protector and transformed him into a machiavellic version of himself, now even allying himself with "evil".
And the best of all, they plotted Deception since MK

A having an epic big boss who was the righful ruler of Outworld, and came back from the dead pulling the strings and twisting everything.
About these characters, most I don't care at all. But they show other perspectives. They show other realms and other stories, I like that. They are not the best characters, but they served for a decent new approach.
Respect that you dislike, but I like. And I should advise: MKX is taking a very similar turn of Deception. It has even been mentioned of someone kollecting the Kamidogu daggers for years. Sound familiar, right?
What I think, on negative side, is Deception was messed on its Konquest mode and the story is not well told on some parts (ex.: Noob-Smoke as sub-bosses). But Deception is not a game of heroes, is a game of survivors. It's one of the darkest, most appealing and surprising stories of MK franchise IMO.