I love ARK, its the only game I play and the only game I care to play right now. My favourite map by far has to be Aberration followed by Ragnarok, The Island is also a great map, Scorched Earth is ok, its just not for me, still a well designed map for the concept, i'm not sure why The Center is even an official map, its clearly unfinished, but still its well designed.
Extinction is a great concept, implemented horribly wrong. Aside from the mentioned issues in the original post..
Extinction was not play tested clearly. With every update there comes a new problem, even on other maps