The DC universe has always sucked compared to Marvel. DC has a handful of decent characters, then a bunch of REALLY bad ones.
As a HUGE fan of marvel, I can say that the same is unfortunately true for Marvel. Maybe it has an extra-handful of decent characters, but there's also a ton of bad ones... Just look at the latest projected movies for Marvel Studios and you will see. Thor is a great example... Really? Thor? I don't want to see it. At all... Like I say, I'm a big marvel fan.
Getting somewhat back on topic, Mortal Kombat lost my interest when MK3 came out. I thought Homing Missles had no place in a fighter, and I hated what it had become. MK and MKII were truly solid titles. MK Armageddon almost won me back, but it got boring, fast. I don't know that I can ever expect to buy (or build an arcade around) a modern MK title. MK 1 and 2 were its pinnacle, the highest it can achieve, in my books.
By the way, that movie teaser looks amazing... Jerri Ryan as Sonya Blade? nice. Nice find Ginsu, I'll be checking the movie out for sure.
As for building an arcade around this game, go ahead. Its your time, who are we to judge what you want to play. All the more power to you for building something that you likely will never see anywhere else!