Now, in the meantime some maps have been removed from the mappool and some of its quirks seem to have been fixed. Also, when checking out the data the last time I saw a few indications that the newer maps initially got some novelty bonus, but that they were somewhat less used as time passed.
So, I did the map pick statistics again to see where things settled now.
I didn't do a rigorous analysis of the uncertainties, but they should be somewhere around 0.1%.
To give this post more of an interactive component, I would be interested to hear if there are maps that you veto for non-balance reasons and what those are.
I'll start:
In 1v1, regardless of the faction I tend to veto Caen (due to the harsh cut-offs, seems I have problems to deal with that) and Minsk Pocket (I feel has too long ways to walk).
In 4v4, I typically veto Hill 331 (for the - erm - complex pathing in the center and frankly I dislike the pinkish soil) and Montargis Region (a) because again pathing is tricky, and with all the pipes, fences, underpasses it is not visually clear how hard it is for a certain unit to get somewhere; and b) the two fuels at the same spot makes for not that interesting games I think, as games seems to be often decided by which team is more successful in digging in around that point).
Edit: The diagrams reflect the data that I collected including games from the 1st of May to the 10th of July 2017.