I've only seen 2 grindhouse flicks part of the Terintino/Rodriguez Grindhouse Double Bill. So I will compare the game with them:
Death Proof, I see nothing in common with the game and death proof but great similarities with Planet Terror, the producers them selves have cited Planet Terror as an inspiration.
I think Planet Terror shres the voilence with Overkill but that is about it.
The plot in PT is cliche, yet fleshed out and easily comprehensible where as overkill had fast jabbered narrations which were incomprehensible for example I have no idea why Washington punched G, how did the mutant outbreak take place, how did G & Washington got paired togethe, I can go on even the things the game intended to explain and had to read them up on wikipedia cause they were all so muffled.
Then we have the language, PlanetTerror has the swears but they are used effectively, the F-count is exponentially lower.
The missing reel segment, eliminated the generic elements of bad going to worse and just skipped to where the action would start where as Overkill skips over an important boss fight, only to have it take place outside the building.
Then their is the technique of killing of important characters in the movie El Furate (I think?) and everyone else made brave sacrafices to save the pack, on the other hand OverKill only had one justified death (The cripple brother) was killed to give purpose to Varla, but the elimination of Varla was probably the most anticlimatic scene in videogame history and rendered the entire journey a failure because the protagonists failed at the rescue mission.
Lastly both Grindhouse movies didn't have incest in any form.
So even when compared to recent Grindhouse flicks OverKill seems bad, maybe if Sega got the rights to Planet Terror, HeadFuck games could've used their GrindHouse skills on a grindhouse movie, not on a AAA lightgun shooter known for brutal force and bad voice acting (which is so bad it is epic).