Shinobi, in 4th you took the penalty even if you didn't take any damage from the attack, now you only get the penalty if you take damage. I like that better. Fire damage is cleared up, base DV of 3. That helps clear things up. In my current campaign, we have a Phys Ad who uses fire attacks, and it's been a pain to adjudicate exactly how that works. Best we had figured out was she does damage as an unarmed attack, but it's fire damage instead. This is much more clear.
Dragonslayer, I would guess the recoil comp on the shotgun is because it seems you suffer recoil for consecutive shots over multiple initiative passes now, not just for the same pass. Previously you could fire that shotgun twice in one pass, taking two simple actions, where now it looks like you have to take a complex action to us semi auto burst fire, which could be a double tap or an actual three shot burst, I will have to see the rest of the rules to see. Either way you could suffer recoil with that shotgun, so yeah I would put some recoil comp on such a weapon.
I have to say, I really don't like how they worked that. Double tapping with two simple actions has been an integral part of the game from the start, and this change seems needlessly complex. If it aint broke don't fix it, and I say it wasn't broke before.