Just got done with my first successful deathless run of RTB: Salvation. its absolutely fantastic. My only complaint is with the Gonomes. I find that they aren't fun to deal with on any difficulty; it feels like none of my shots are connecting, until they suddenly drop dead. I think if they flinch more, it would feel and play better, especially if they had better headshot reaction. As well, I'm not really a fan of the Gonome design, in OF they looked like bloated zombies, where the headcrab had fully fused with the human and the chest cavity had fully mutated into a mouth, it even had its own biting animation. But in RTBR & S (as well as EZ2), it looks like a fast zombie was just enlarged and the headcrab doesn't look like it has fused with the body. it would also help if the fingers were actually animated, and not just static and rigid.
1