Hi Rizel - welcome to the forum.
Basically, the original MOTR music is very boring and repetitive

(wwwaaaaaiiiiittt for it)!!!!
BUT
It remains sonically interesting simply because of the sounds used. Rob was a master of the SID chip, and this is where the ear fodder lies for this particular SID tune, IMO.
The problem with your remix at this stage can be blamed pretty squarely on the sounds you have used. I agree with Romeo that the production, mixing and even arrangement is also not up to scratch, but at this stage it is just a demo, so lets get the basics right first
As far a synth sounds go, you can't get much better (or cheaper - i.e. FREE) than 'Synth1)
http://www.geocities.jp/daichi1969/soft ... h1v107.zip The sounds shipped with it are rubbish, so download some more banks, or even make your own
Your drums are also pretty dire. Go here for a list of free drumsynths and samples:
http://www.synthzone.com/drums.htm
If you have some cash to spare, you may want to look at buying a workstation vsti. The best budget workstation synth has got to be Purity @ $199.00 USD:
http://www.luxonix.com/home/en/products.html?id=purity
It has a knack of sounding very crisp with very little effort, and has a very good drumset. Ignore the demo MP3, it can sound a LOT better than that
Finally, you may want to look at continuing to use a tracker, rather than jumping into Cubase. Renoise should be familiar territory for you, and it's (kinda) free.
http://www.renoise.com/
Don't give up & may the force be with you
