1. Do you consider frigate battles fun (compared to older versions)?
Mixed feelings. Prior to all these penetration changes I routinely would try and 1v1 connies in my frigate, relying on superior sailing and carronades to try and win. With the new penetration changes, anything shots not square on just bounce off, so trying to S-fight a bigger ship just leads to frustration. So now I no longer try and fight the ship class just above me, which I find sad.
3. Should marines be tweaked?
I feel that, in general, all of the boarding upgrades are too powerful. For example, someone with all boarding mods will absolutely crash someone with all sailing/fighting mods, usually in less than a couple rounds once boarding commences. However, the ship with the sailing/fighting mods does not insta-win in under 2 minutes the person without sailing/fighting mods. Hence, I think all of the boarding mods need reduced.