I had issues with a good chunk of the last arc, mainly in how Saki spent entirely too long in the damsel in distress role, especially after how she had been portrayed as a character through the first 2/3 of the season, but it all worked out, so despite that, I am going to go ahead and give it a 10.
Great story + great aesthetics + great characters (well, minus Momowhatshisface, but on the plus side, he was never pushed forward as more than just background noise, so one could largely ignore him) + great sound. Really, just a fantastic anime.
There are stories that could be told, I'm sure, through OVAs, like what occurred between the time skip to adulthood that made Saki and Satoru stop being friends? Or what gruesome fate awaited Maria and Momoru? Make those OVAs!
But, overall, I was very pleasantly surprised at how the time skips didn't make me go "omg, they're skipping too much" or "but what happened to blahblahblah".
I usually hate time skips.
Easily the best show of the year so far, and will be one of the rare shows I fully intend to buy on Blu-Ray when it is hopefully released for western consumption.