Injustice 2 is a better sequel to me. I actually hated the first game. Didn't love the roster and even if I did, the game was still really ugly. Same reason I didn't like MK9.
I don't really understand the complaints about the gameplay. Yeah it's different, but that doesn't mean it's bad or inferior to others. I enjoy playing it just as much as I do Tekken 7. NRS gameplay is clunkier for sure, but once you adjust to the rhythm, it's pretty satisfying. Hits sound good. I also feel like the only reason the NRS games burn out after 2 years is because they stop supporting it and fans know they will stop. I don't know if it's NRS or Warner Bros. That want to milk the series like this, but I wish the lifespan of the games were longer. I'm really sad that MKX appears to be done. I would have loved a KP3. Just seems like a waste of great work.
I do want MvC:I to get better, though. Not all the characters look like trash and I would like to see what they could do with newcomers. I really want see some Asura, Cable, or Psylocke DLC in the future. I feel like it just needs a better roster.