The Layout between Blackout and Warlok has a general layout that is similar, but there are some small and a few big differences that add up to a much better playing game.
1) Layout. Warlok replaces the saucer in the middle right hand side of the PF with a bonus collect gate.
2) I actually prefer the bank of standups on the left hand side of Blackout as compared to Warlok, but this is a very minor consideration in the terms of overall design as the bumper ledge below the "1" bank starts that ever so deadly side to side arching of the ball's path.
3) Flipper arrangement. The Kubin/Kirk connection is known for their wide spacing with a post in between. This game has it and your flipper skills need to be adjusted accordingly.
1) The rules. These are much better. The whole build and collect bonus with strong play during as well as at the end of a ball makes this the kind of game that you never really beat (consider the best Bally games of this era). Between that and the middle drop target lighting up for the extra ball when 1-2-3 are all in line on the bonus ladder. all 14 shots on the PF have a purpose and the balance of the game is incredibly well managed. I passed on a Blackout, not a problem. Finding a Warlok was one of the more difficult things I have had to pin-quest for. And frankly, I got lucky as someone else told me about the one I ended up buying. Blackout you can flair and still have a pretty good game. Warlok requires tactical considerations, solid timing and sniper skills.
Voices and multiball and an art package that doesn't look like poot. I'm going to try to make a BG (and maybe a plastic set) based off of my Heavy Metal/ Moebius collection (http://ipdb.org/showpic.pl?id=5175&picno=32570 and http://ipdb.org/showpic.pl?id=4576&picno=11434 for examples). Constantino Mitchell should be gurned out for ripping off the mighty Steranko. Nick Fury is upset that his image was bltantly ripped off of the cover of Agent of shield #6
For me, Blackout is a good game, Warlok is a much better one.