I agree with some of these maps being removed.
SG Ancient Japan - Hardly any Tier 2s (at least for me), games last too long, hard to find people, PvP isn't the best on the mountains.
Origins - Too big, half to a quarter of the people die off corn, and it's very big.
But Fortune and Fallen Empire (I think you're talking about v2 but idk, just going on my assumption) are underplayed, that's a fact, but they are generally good maps, although they do have their faults, but not too many to be removed from the servers. You probably think they're bad maps because you've hardly ever played them and then when you do, you don't have a route (which is the case for most people).
Not trying to offend you, just voicing my opinion.