Quoted from vegemite_nick:
It is well behind BBB in completion, however, all of the modes are there, they all work, the light effects work, the animation is fantastic. The Sudden Death does not work that well, it needs to last longer in the weakening stage to give the player some real opportunity to keep it going. Maybe for the coin op environment removing it would have been a better option, but I think it can be made to work if the experts get their way. If the programming environment is there, I can't see the required changes as massive. I may be wrong, but staying positive anyway!
Yes i do agree on the fact it could have been an even more fantastic game with a better code but some flaws were not corrected and it was going to have a new game rule with removing the sudden death one (there was 2 game mode as you know) and improving the other one. Also, if you compare with other capcom games, you could see than those have fantastic light shows happening with good shots, new sequences and else... on Kingpin, there are some, but really few like the casino or the start multiball and it feels kind of obvious this one probably still in work in progress. Kingpin feels a bit like CC but even less finished, so it needs a new software like ccc to be as designed and greater.
Regarding the proto rule, yes, this is fantastic to have a whole game with a wizard mode and such great animations, probably the best one of its time for sure. The layout seems great as well with its ramps.
Here is a video of PM and BBB in dark environment just to compare the light shows, it was one of the capcom asset: