Just watched part 1 on funimation and it was pretty good. Certainly having Hyoutei as the underdogs needing to really dig deep every match.
The new Rikkai player is pretty laughable from a story perspective. They could have easily introduced him in the pre match training montage instead of during the match to make more sense.
They also do recognize that this is after the tournament as Yanagi mentions being inspired by Niou playing Germany and them being at the u-17 camp.
See how fast part 2 comes out, it did just release in Japan today as well.
Also as far as the subs I'm not sure if this is just a lack of my understanding of Japanese (because I only know some words after hearing them 1000x) but there were a few lines where it didn't seem to match up with the dialog, such as someone saying a name and it not appearing in the subs. And of course the unfortunate side effect of translating Sanada's black dragon more literally than a fansub might.