Some good, some bad.
I'll start with the bad, so that you can improve on it, then I'll go to the good to cheer you up after reading.
1. The drums. All around... not too good, sorry to say. Even the patterns. As a drummer, I'm sure you know one of the main elements of a good drum pattern is simply... GROOVE! Let me make a quick quote from a DogsOnAcid interview, where they get an established artist to answer questions from the members there. Its all dnb. This is Q&A 18: http://www.dogsonacid.com/showthread.
php?threadid=585407
Quote: "Breaks. How do you get them realistic. Rolling like a real drummer. Technical wise not by feel."
Response: "It depends
In dnb it is important it is mixable - and also that it sounds alright in the mix. As such I prefer MOST of the time to have quarter notes strictly quantised, eighth notes probably/possibly strictly quantised and th 16ths, well, we'll see.
What's important is that a) that drummer is more than likely a bad motherfucker. For example, James Brown didn't have Clyde on drums for umpteen years cos the geezer didn't groove like an absolute motherfucker. He had him play for years cos he was a fuckin groove machine. This should be respected and utilised - your tracks will benefit from it (that's my belief anyway).
So it is a question of balancing what you have (raw grooving drums) with what you want (tight for those DJ luddites )."
In other words, dnb is about groove. I advise sampling some old skool breaks, because no matter how good of a drummer you are, those old skool dudes could groove. Check my first news post for some sample pack links. The drums in your song.... sound sort of rushed. No real flow or groove.
The samples could also use some work. It sounds like an Amen layered with a 909. Try just using a basic breakbeat sampled and layer that. Then, layer individual kicks and snares on top. That's generally how it is done.
2. The arrangement. If you were going for a DJ type arrangement, then you need to know the DJ structure of dnb. This is more of a non-informed rather than a negative. It goes:
64 bar intro
64 bar drop 1
32 bar middle bridge
64 bar drop 2
32 bar outro
Its been tried and true, tested for many, if not all dnb songs released in the past 10 years. (there is one variation on it, but I'm not going to waste your time by mentioning it).
Ok, now that I got that out of the way, the good.
1. Reese is fucking awesome. I don't know how you do it, but they do always sound awesome. Not the wobble, but the 'duck' one. It sounds almost pro, but the drums are always the limiting factor, holding it back. If this had some real groove, and that reese, it would be an ace track.
2. Synths are also great. They really improve the mood of the song, and they sound nice too. Yes, the power of simple filtered bleeps. Never underestimate it. Nice synth usage here.
And that's it. Hope this helps you improve. You've really got some talent there, but you just gotta stop taking your drums for granted. Really focus on working on them. A/B with professional tunes and overall just keep trying. That's about all I can say.
-Nav