Ummm ... I dunno. On the one hand, having an all new original story is definitely intriguing and the items sound useful (in part because they say they are in the description), but I could see people having the same problem they did when DLC first became more common place and saying "why wasn't this in the main game already?"
Cave of Trials challenge and new map features? Ok, I get it. But why would I pay for a hard mode?
DLC Pack 2 definitely looks the best out of these and the Expansion pack bonus isn't bad for a bonus, but public opinion on this could go either way.
Personally, the only DLC I ever bought was Arkham Knight Season Pass, and while I dug the costumes, Batmobiles, challenges, and extra story missions I got, part of me wishes I saved money and only bought the stuff I cared about. Oh well. In that case, I felt kinda bad for getting Arkham games for $5 and wanted to support Rocksteady, so I wasn't too bummed about it.
I typically avoid DLC unless it adds to the story though. I'm with you on not wanting to pay for costumes, though I could see myself being suckered into it. I did buy a Rocket League pack at some point, or maybe just the Delorean. But come on. It was the Delorean.
Long story short, my opinion on DLC depends on the nature of the DLC.
