The mine is fine. Using it while PvPing with fighters is dangerous for both players as the mine has a HUGE explosion radius. That mine is for bombers attacking Battleships.
Also, it is next to impossible to use mines effectively against a fighter. IF the pilot pays attention to its surrounding, he will see them and be able to avoid those easily. Unless you launch 10+, but thats suicide as those would be spread in the area, and if one explodes, the chain reaction would kill both players (believe me, ive learnt that the hard way).
So i vote Supernova mine stays.
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Another problem ive found is that BS weapons range is too short. with big ships, sometimes you have to be 200- meters to hit another ship. Using infernos in a RH bs is quite dificult as those weps fade out before reaching the target. The problem is not only with the inferno and RH BS, but with most weps and the big Battleships.
(If you find any mistake in my English, please let me know via a PM)
(Really, I speak terrible English, so please, tell me if I make mistakes. I'd like to improve it a bit )