agreed, i love mahi-mahi and it is just plain fun to play on. it works for a variety of weapons [the only ones i avoid are ones with bubblers, as people will push you off into the water], it's rarely an all-or-nothing match on it, and it's just fun to jump from platform to platform and occasionally laugh at someone falling in the water. plus, the water level changing means that the tides can turn [no pun intended] completely halfway through the match and it's anyone's game all over again.
my second favorite map is the museum. although the spinners get in my way when i'm a charger, it's still a map that complements all weapon types and matches are usually, although not always, pretty even [at least, few 20% differences]. i just really enjoy playing on it although i can't explain why, and i'm great at all modes on it. if it's up and i'm not at work, i'm playing.