6 is pretty accurate for this game, I went a bit higher myself because I found the story really refreshing and was impressed with the alchemy system, but I could definitely see a 6 for myself. That said reading through your review it sounded harsher than that final score so maybe it doesn't match your own text even if I feel it's accurate for what I played myself.
I'd suggest giving Atelier Totori a shot since it probably has the best story of the lot and give you infinitely more freedom to do what you want than Rorona. Graphics don't get massively better at that point but the improvements in story and gameplay are notable.
Significant amount of grammatical errors, out of curiosity does someone edit these reviews before they go up on that site you guys made or do they go up as is?
...