The first 2 minutes are good, it could almost be its own track. Quite atmospheric and smooth, I like the pads.
The drop at the 2 minute mark isn't good, but I can see where you wanted to go with it. I would suggest making the drums, specifically the kick louder, and sidechain the bass to the kick if you have not already done so. The kick and snare at the drop has to be the centre of attention.
Also, as dougal mentioned, you need a sub bass under everything to give it the "oompth" that its missing.