The thing about Reservoir Dogs though, it's a pure "caper" film through and through. With the exception of the tipping scene in the beginning, every thing that happens in this movie is directly related to the heist.
There's no old existentialist cop on the verge of retiring, new hot shot on the force, guy doing his last heist, guy torn between a life of crime and his girlfriend or any other of that other personal stuff that you get in films like Heat or The Town. You may not see the heist in Reservoir Dogs but it's the only thing that matters in the movie. Nothing else is going on. Hard to label it as anything else.