Hey man...
... looks like u´re new to Reason, and I can only say that you are doing everything right!!! Sorry, the song wasn´t good at all, but playing around like that with automations and effects will teach you things in Reason very quickly.
The pre-made beats in Reason ARE good, and it´s nothing to be ashamed of using them. Personally I rarley use them, and if I do, I alter them to unrecognizable levels.
Remember to put the end of your song where it should be (shift + left mouse on the timeline), in this version theres a couple of silent seconds in the end.
And yes, the quality gets good with Reason, but you did override in some parts, you should learn how to use the compressor/limiter and/or the EQ a little better, to avoid overrideing.
Have fun with Reason!! It´s a good program!
/Rucklo