There are some weird incongruous brushes dotted about, usually ramps, etc...
marth and magal could probably have put it more tactfully, but I think they might have a point - this map is ok, but I think its about as good as it's going to get. I think you might find it more educational and fun to start a new map with the skills you've learned which addresses the inherent problems this map has (large mid section with high r_speeds, etc...) and builds on the strengths (fun jumps, etc...). Also, it seemed to me like a bit of a copy of back2back/pbcup/xbmap1, etc..., so try and come up with a totally new and exciting idea with all the cool things you learned how to do this time round.
good luck in future!
- Dagless