on a scale from 1 to KICK ASS!!:

I- KICK ASS!!
II- 4
IV-3
V-7
VI-10
VII-8
VIII-6
IX-5
X- ouch
X-2 don't start with me about that

on the other hand, normal fight music is the most often heard and doesn't necessarily need to be awesome. Almost all the other music in X is good. If you were ranking boss music, that would be another tale...