Can't emphasize enough how good this map is for a first H5 map. The layout is impeccably designed, and handles 4v4 quite well (even though you mentioned 3v3 as the ideal). Lots of great angular geometry, plenty of interesting elevation changes, and the teleporters/man cannons add to the chaos.
This map essentially set the tone for the rock/steel aesthetic, which I'm sure will be copied over and over again.
A great little map that's certainly one of the most memorable from the early crop of H5 Forges.