Some of it's got the wrong timing.
When the percussion comes in, it's too fast for the melody. You should really make sure that it sounds right when you put in percussion. For example, while I may use the same plugin for every piece of mine (and yes, you're right on that part), the melody and the percussion have the same timing.
Now, aside from this little paragraph here, I've stayed on subject. I'm pretty sure you appreciate that when others do it. So do they, and so do I. I didn't rate it a four because you're an idiot or something like that (although you're not very wise), I rated it that because the piece could use some improvement.