Valve was still in there "just take some flat ground and put some props on it"-phase.
Mid is flat ground with some crates and a catwalk for elevated flat ground
Yard is flat ground split in half by crates
Second is flat ground with a catwalk for elevated flat ground (though I've always felt like it's less of an issue on second it's still pretty bad)
Last is flat ground with pipes for elevated flat ground
Also I really dislike pushing second. It's just the combos spamming until someone falls low enough for the med to pop
I don't hate granary but it's not a map I enjoy playing either