I'm giving this map a -1. There's so many Nether themed maps already, and another one just isn't original, nor good for the server. Besides this reason, the map itself isn't attractive at all, and the building could use lots of work. It seems the theme isn't well executed at all, as most of the map is parkour and there's no theme seen. As for the parkour, it definitely meets it's difficulty, however it's very repetitive and boring.
The map could be improved very much.
Cheers,
JakeNoot