Sate your hunger for blood... and RPG elements.
Something that the bethesda development team mentioned to players in the manual for Fallout 3 was the massive scale of creative opportunities in post-apolcalyptic storylines - Apokalyx also takes that to heart, even adding origin videos for the type of class of character you choose within the arena. As the reviewer before me stated, yes, there are going to be sonny comparisons - and that isn't necessarily a bad thing. Instead of being a clone or the like, Apokalyx successfully makes it its own.
Long story short, you can kill shit and build your killing machine, so go try it out :-)