It looks like it would be fun to drive, but I see a common problem. With all of the wiggly parts in the middle, that is where most of your deslots will occur. That means a lot of reaching across the track to get cars and put them back on track. That is a pain when multiple people are racing.
Also, with so many R3 and R4 curves (and all their borders), this is going to be a little bit expensive to build. You might want to try to build a track with no more than 12 R4 curves, since that it how many come in one box.
If you are concerned about the track having too many straight sections and getting boring, consider adding some elevation changes. Either build some scenery under part of the track or get Carrera's bridge/hump track set and use that to raise up part of the track. It really adds character to a track.