I bought the DLC at full price to show support, but I can see why others would say its too expensive. I wasn't particularly hyped for more guest characters, and the legacy characters were okay at best. Overall, I like the game and think the gameplay is solid, and the way they reinvented some characters (ex. Kenshi) was excellent. That said, the overall roster is one of more boring rosters in general, and the art style is boring.
In terms of the roster, they've given attention to some of the B-tier legacy characters, like Ashrah, Reiko, Tanya, Li Mei, and so forth (kind of like they did with Injustice 2). Problem is, this has come at the expense of excluding several legacy characters. Also, there's not one entirely new non-guest character, which is bizarre.
Finally, in terms of art style, every character has some kind of robe or robe variant, basically. Too much similarity across the board with only a few characters that actually look unique. Cage looks the most unique and he happens to be wearing button-ups as his default, lol. Its not even that wearing button-ups is special or anything, its just that almost every other character is wearing the same type of robe. Some of the alt skins have remedied this issue, but even then a lot of the alt skins are just color variants or also robe-looking attires.
Overall, I'm sad to see support ending. Its not my favorite MK but it has its high points.