Harpoon is largely useless, but I played a bit ago, my spire had a hwacha and 3 harpoons. Just for fun. Had some cakes, was a 3 on 3, we got 2 harpoon kills and a few hwacha kills. Granted the other team was underdog by a mile but still, was one of the most entertaining matches I've done
Doesn't hold a candle to the other night when I had sleep delerium (playing for 6 hours, twas 2AM) and had two crew members who were... quite drunk. The only coherent crew member decided it would be entertaining to have us on a 4 gunner, 5 flare gun mobula. THAT was entertaining.
But yeah, Harpoon == terrible but when you manage to use it effectively, it is quite funny.