There's a sea of general comments, some for the wrong reasons, some because maybe (as I have done on a couple of occasions) someone found something okay but don't really have any suggestions or the dev clearly already has future plans in mind, and some I'm sure because the comments being non-anonymous can have a bit of kickback if you accidentally upset someone (the format as a whole discourages honesty a little bit).
I've noticed what a few people do in feedback is to give a clear indication they've played the game. by mentioning something they would not know if they hadn't. Then list any bugs they came across (which is an easy win for a dev to fix later), any more general issues, and suggestions. These I find the best feedback and I've tried to take onboard this sort of style when I'm doing it. I wish a bit that itch.io didn't have comment fields for this but some kind of mini survey/standard questions like "What did you enjoy", "Were there bugs", "Were there other issues", "Do you have ideas to improve the game or ideas for paths for future development". It would discourage those not giving genuine feedback and give some direction for those giving genuine feedback.