I'm at a point where I have to admit that I don't know if I will achieve my goals with Chapter 1. =/
Let's repeat what the conditions are for S rankings on Chapter 1:
Targets Destroyed - 100 or more
Accuracy Rate - 75% or more
Damage Sustained - 599 or less
Critical Hits - 90 or more
Killchains - 80 or more
Items used - 0
Limit Break Used - 3 times or more
Mako Collected - 90% or more
Times KO'd - 0
Time Expired - Less than 20 minutes
Stage Missions:
Saved Civilians: 24 or more out of the total of 25 civilians.
Save the girl, Rio: Yes
Retrieve Cardkeys: 5 out of 5 cardkeys. Easy and Normal only demand that you find 4 cardkeys.
Help/Save the WRO Members: 12 out of 12.
You can allow one civilian to die and still get an S ranking. I expect that IF I get to the end of Chapter 1, I will have indeed saved only 24 civilians and not 25. Dirge of Cerberus is way too random and 1-3 civilians will often die regardless of how good you are at the game! This is especially true in JORG because of how slow Vincent runs (even slower when his gun is raised) and his slow firing rate.
Exhibit #1: The first four civilians
Four civilians, four DG soldiers. Four times out of five, one civilian here will die under the heavy fire. Even if you manage to headshot the first soldier as he comes into view, the other three soldiers will quickly come into view and ruin your day. Keep in mind that in JORG Vincent's firing rate is so slow that you have to wait roughly one second between shots.
There is no going around the randomness. Normally the soldiers will fire immediately upon spawning. Randomly a soldier might wait one-two seconds, so you can imagine yourself how unlikely it is that all four soldiers decide to be patient with their triggers. You also can't employ some trick like headshotting two DG soldiers simultaneously because by the time two soldiers line up, they will already have started killing civilians.
Exhibit #2: Civilians #12-#15 under Dragonfly fire
As soon as the civilians spawn the Dragonfly will be firing at them. Your goal is to get around the corner and fire at the belly of the Dragonfly so that its barrage ceases.
If you are unlucky, one or two civilians will die before you have even made it around the corner!
If you are lucky, one or two civilians will die by the time you have hit the belly of the Dragonfly at the earliest possible time.
If you are very lucky, everyone will survive.
None of this is fair. In most runs, I have one civilian die at Exhibit #1 and one civilian die in Exhibit #2 regardless of how awesome my play is. That is one civilian death too many. Although less frequent, civilian deaths from bad luck in these moments is still pretty common in the post-JORG versions.
I haven't even raised the unfairness of how likely you are to get hit by enemy fire no matter how skillful, strategic and knowledgeable you are. Throughout the whole chapter I must not receive more than 599 damage. My goal is to clear this 7-minute segment of the chapter receiving 200 in damage or less. At best, I have managed to get through with about 400 damage! There is too much randomness involved. TOO MUCH RANDOMNESS!
Even if luck wasn't involved, I still have the choices to weigh as to how much I plow through the stage due to the strict clear time requirement and how many enemies I defeat if I am to destroy a total of 100 targets. There is the risk that even if I am blessed with a miracle and I clear this segment of the chapter with less than 200 damage, I may have ended up killing too few DG soldiers for the final result.
Post-JORG, you will get an S ranking if you receive less than 950 in damage. Oh how I wish that this was the requirement in JORG. I will keep trying but the odds are so stacked against me that I can't promise I will achieve what I'm going for.