It's five bucks a character, then like 20 skins for the last ten. Idk I'm enjoying the game still and I really dont mind shelling out money for fighting game dlc, but I dont really spend much money on video games to begin with.
I do think the characters have been a little hit or miss for the most part. I've been pretty vocal about how crappy I think Spawn turned out, Terminator is way too mobile to represent the source material, and Nightwolf's variations need more fine tuning. Them teasing and clearly planning for Ash only to swap him out with Joker instead was a huge slap in the face.
I get why people hate fighting game dlc, but every character brings with them new playstyles, new matchups, and a new element to the meta. If that's worth it to you then you should buy it. If you're only interested in buying characters you would play, then you probably dont need to
The only season pass I didnt buy was the first Tekken one. I just decided to switch to Negan and use an armored launcher on anything I wasnt familiar with