I am mostly okay with Doom being a bit unfair, especially at its current cost. Make it fair, and its cost needs to be lowered to match Aurora (which is also overpriced a bit). I am not opposed to mines being spawned a bit further away from frigates (and only frigates), but I rather have mines spawn as they are instead of far enough away for them to easily dodge. AI frigates already easily dodge mines unless they are pinned somehow. Fighters are missiles as far as I am concerned, and I have no problem at all with mine spawns telefragging them instantly.
I have been on the receiving end of frigate near insta-kills once or twice. It is annoying, but I am mostly okay with that. Just need better bullet-hell twitch reflexes. I do enjoy it when I pop enemy small ships with mines. It is less annoying than friendly fire incidents when I have Dominator/Legion/Onslaught in my fleet with mine users. Doom is a pseudo-capital, and star fortresses (the most problematic mine users) are a major investment. If I blunder into range of a capital, and it has the right weapons, my frigate is dead just as fast. Or, if I see fast interceptors coming, my frigate is probably dead too.
P.S. Forgot to mention I play the game at double speed, or 2f (and I would play at 2.5f or 3f if the game did not lose fidelity at speeds higher than 2f). I suppose I can lower speed down to the standard of 1f and have more time to react to sudden mine spawns.
However, if there is a problem with Doom or other phase ships, it is that default AI will happily chase them and play into the enemy phase ships' strengths and get picked off. Micromanagement (such as deathballing the fleet) seems required to avoid taking unnecessary loses when fighting enemy phase ships.