I'm glad to see other people agree that the ranked version of Moray and Arowana are the best, but I feel that they, along with Mackerel, need to have a redesign like Urchin Underpass before they can be anywhere near as balanced as some of the other maps. Walleye has its problems, mostly with spawn camping and a lack of ways to take the center, Camp Triggerfish doesn't make a good first impression, and for some reason a few people think the upper area of Saltsray Rig is crucial to take, when you never need to touch it at all.
I just really hope people don't cry out to Nintendo when they fix Moray Towers because they liked automatically winning using minimal skill with a sniper.