My main gripe is that lava maps were transformed into acid maps and far less spectacular. Additionally acid only appears on map outskirts and small puddles in the map.
Plus who wants 1:1 realism in Evolve? It could've been higher damage DOT than acid.
Additionally the world overview of Shear shows fires and lava all over but hardly if any evidence of acid. It bothers me greatly.
I also feel that with more work the wildlife could've worked. (Mangler was cut for being too similar to chomp plant. Lackluster reason to me.)