The layout is very unique, that’s what will matter in play, also the junkyard and refuelling tower are unique to this map.
It really confuses me when people whinge saying all the maps look the same, because they really don’t. I think people are just used to being beaten over the head with bright colours signifying “this is a different zone now!”, like in WoW / Diablo / Borderlands… Last map was mostly green so the next one is bright red to clearly define a change. The changes are subtle in Evolve, but help to sell it as a real place.
Also, I suspect the reason everything is set on Shear at the moment is due to having to invent entirely new flora and fauna to convincingly represent another planet, and that’s quite a lot of work. Hopefully there’ll be more planets in future, but in the near future I think everything will be set on Shear. Although there’s still plenty of room for fun and interesting maps on Shear, and they could introduce a new biome with a different feel and new tactical map elements.