I voted Sindel because it is the only one I enjoyed from both cosmetic and gameplay perspectives. I would have prefered Sindel to have more human skins and one revenant skin (+ its shaders). Her intros/outros could have been way better though, they weren't very creative with them. Her fatalities are bad.
Nightwolf is annoying in both cosmetic and gameplay. His gameplay is boring and only his third variation is a bit fun to play. His skins are pretty bad, the only surprise being that his revenant skin may be the best looking one. His gear is pretty lame (especially the helmets lol). I do like some of his outros/intros though. His fatalties are bad.
Shang Tsung is a good DLC, I actually I think it is the best DLC from a more objective point of view. Cool looking skins, great outros (intros are a bit disappointing tbh) but forgettable gear. His gameplay is just not my cup of tea but I thought it was okay when facing some Shang Tsung online. I like his Kintaro fatality but the second one could have been good but the execution is missing.
I hate Joker in both gameplay and cosmetics. A big part of my frustration about this character is that he took the place of Ash motherfucking Williams (which is why I bought the KP in the first place because they hinted his presence before swapping him with the Joker at the last second). His animations look goofy, his skins are bad besides the default one that looks... acceptable. His gear is pretty bad and his fatalities are bad.
I expected so much more of Spawn, he's one of the most requested characters since MK9/MKX and saying he's disappointing would be an understatement. I never "wanted" Spawn but I wasn't against him being included, and there was so much hype around this character I think we all expected NRS to blow our minds with him. But no. Some of his intros/outros look good but I don't like his skins/gear. I don't know the character and I assumed all his gear and skins are inspired from the comics so I can't blame NRS for being loyal to the character (for once). His fatalities are... not that good.
And finally the character I remember he's in the game only when I see him on the select screen, Terminator. What a disaster, what a terrible adapta... Wait... No ! He's the PERFECT adaptation. Both Terminator: Dark Fate and Terminator the MK character are awful, uninspired and forgettable. NRS totally respected the source material for once (maybe even a little too much this time).