I still keep asking the same question of why do people buy a season pass when you could just wait, see/read about the content and see if it's worth it to buy the season pass or individual DLC's. I never once bought a season pass.
Can't speak for anyone else, but I was getting this game and Witcher 3 (and eventually MGSV, but only because of how broken AK was) with my graphics card. It was the only game I was actively looking forward to for the past year or so.
Since I was definitely going to play the game to completion as it's had the best/only decent Batman games in existence, I went ahead and bought the season pass for half-price from Nuuvem once Rocksteady/WB released (a general description of) what the pass was going to consist of. I knew the DLC would largely consist of piecemeal content like with past games, but I still would've been willing to put down $20~ if only to see how bad the DLC was and to give others ample warning — if it were decent or on the level of Origins' Cold, Cold Heart DLC, I would've been perfectly fine spending that much.
The reason why I won't be buying any more WB-published games: I couldn't predict that WB would allow its biggest title in years to release in such a terrible state on PC. I only based my expectations the past few PC Arkham releases which were fine outside of some DX11 problems. I'd heard of Mortal Kombat PC sucking, but never figured that'd have any bearing on Arkham Knight's release (not sure if it did).
In the end, I spent $23~ on Arkham Knight in total, and my only disappointment comes from the state of the PC release, along with the complete lack of DLC. I would've been fine spending $60 on the game itself, and I definitely would've been fine only spending what I did pay, if only the PC port wasn't a hackjob. Like I said, I had an idea of the content I was supposed to bet and based my purchase off of that — it's what I was willing to pay to see all the content the game had to offer. However, I had no idea WB would bungle the PC port on such a base level. Because of that, I regret that $23 purchase, if only because I could've gotten it for even cheaper and not given that much support to a developer/publisher combo I had some trust in.