I felt the same way on launch. Played a few games on a pro and felt meh on it and couldn't wait to shove my money in Maiden beside it. Didn't do anything for me.
Last week I went back to the same pinbar and there was 8 credits left in it. Did a 4 player game and burned thru them pretty quick. Started another 4 player game and about half way thru it started to click. Once it clicked, I was hooked. Got replays on all 4 games. I went back a couple more times over the weekend just to play JP. Someone posted a link to the rules after my last visit so I'm looking forward to my next visit and see if I can figure it out some more.
The pro rocks and would be my must buy pinball. Looking forward to trying a premium someday.