I think I was kinda in the same boat as you.
In theory, I loved the fact that if you wanted to check, the game would tell you when you theoretically had enough information to identify one of the crew or passengers, so you knew where to focus your thinking. But I got stuck on some characters who seemed to me to be implied or hinted, but for whom I didn't think I had positive proof.
I eventually got tired of continuously reviewing the same scenes over and over, looking for some detail that I had overlooked, and read a walkthrough to find out what I was missing. It seems that I hadn't missed anything, and "an educated guess" was the standard expected by the game, not "definitive proof". But I was burnt out with the game by that point and stopped playing.
If you or anyone else is interested in playing more, I recommend:
I played a little of Silent Hill: Homecoming but got tired of it about 1/3 of the way through (I guess). I also bought Silent Hill: Downpour but gave up on that even more quickly. I don't recommend either of them. Things introduced in the earlier games for specific psychological reasons related to the plot - especially sexy monster nurses and Pyramid Head - tend to be regurgitated in the later games for no real reason other than "Silent Hill", which removes their impact completely.