I have very mixed feelings about this...
...but I voted it high because it has potential.
The good:
1. Vocals. Not many people put an MC into their production. Not original, but rare enough to be a treat. (No, it doesn't belong in Hip-Hop because it has someone rapping! Other reviewers who know nothing of musical genre can sod off!)
2. The bassline. My GOD that oldskool organ rumble; and the lowest note bottoms out _right_ at the sweet spot. Sometimes a saw wave with some vibrato is all you need! I almost threw up when i heard it...out of my dick! LOL but seriously, it adds a real big track feel while keeping it in your face and personal - this used to be referred to as "the panic", and you almost never get that rush with modern dance music.
The problems:
1. It's Drum N Bass: Where are the drums? This needs a punchy drum line, or if that will interfere with the vocals too much, a crisp drum line. What you have is muddy and it doesn't really lend any "catchiness" to the track - I keep waiting for the massive hook and it never happens. It sounds as if the bassline is drowning everything else out due to compression later in the chain.
2. The lead line sounds a bit like it's from SimCity2000. I don't know why, it just feels like that. That being said, i think that type of melody line could work here, but it may need to be re-imagined, instrumentally speaking, before it fits well.
Work on this, work on more, I expect to see good things from you! (and with a catchy name like Nick Sandwich, you can't afford to not be good :-)