As far as I'm concerned, the best aspect of this "Percent" was the fact that the topic was taken seriously, not in the shallow, sugarcoated and honestly silly way that has characterized other recent dramas (to name but two, I recall Sugisaki Hana playing a blind girl working in a kitchen in "Koi Desu" - as if that would ever happen in ultra-regulated Japan! - and Emoto Tokio portraying a paraplegic character working as a cleaner in "Kinshicho Paradise" - two series I dropped precisely 'cause I felt kinda insulted by that unrealistic approach to this topic!).
Another thing I appreciated here was the cast performance, pretty damn good, kudos to them, particularly to Ito Marika and Wago Yui who get a special mention!
The OST and the rest of the "packaging" (direction, photography, editing) were also totally OK.
On the other hand, I wasn't fully convinced by the script; I think they had good intentions but the terribly short length of the series (only 4 episodes!) meant they ended up cutting corners here and there and either left details hanging (like, what happened to the producer FL and her BF? Did they get back together?) or else failed at portraying a smooth character development (like, the director was portrayed as an A-hole until *bang*, complete U-turn in one single scene - that's sloppy writing, sorry...>___<).
Still, a solid 8/10.