Host state rewind currently only affects hit-scan weapons (lasers, mg, flamer) but neither ballistics nor missiles.
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20 pts of damage per volley into a mech that doesn't even have that much armor, should have killed it.
That is, (if that's true, ) there's a bug with hit detection. Looks to me like: fix the bug.
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Packs of light mechs are ruining this game.
I'd agree that packs of light mechs on one side vs. few light mechs on the other side can be very nasty. ECM+streaks is another issue, as well as IMHO the LT/RT hitboxes of a raven. Lots of light mechs attack an isolated assault? Change your tactic and stick to the team. If they focus fire, you should focus fire with your team mates as well.
The lights appear suddenly and surround you? Again, most probably ECM / friendly scouts fail (or an issue with enemy position sharing; currently only the position of a targeted mech is shared).
From the perspective of a light, you can (IMHO should) 1) scout/spot 2) attack isolated mechs 3) support heavier mechs e.g. by attacking the rear torso of an enemy.
COM-2D and RVN-3L can be equipped to cheese builds, would you also say the other COMs and RVNs are that nasty? What's about spiders?