Things why I'm dissapointed:
-Because Ash uses only 11 pokemon through the league. In Sinnoh Ash used 19 Pokemon, for example.
-Because the leagues to be vey rushed.
-Because we see skipped 2 of Ash battles.
-That Virgil gets ignored in the league. At least I hope that the excuse was believable
Things that I'm fine and/or I like:
-Ash losing to Kotetsu. For me, Kotetsu is a trainer like Virgil, Trip, Stephan that adds unpredictability to the plot.
-Ash getting Top 8. Sorry, but we forget that BW was a "reset". I need to remember that past accompliments doesn0t count in the BW saga.
-The animation that looks bright than ever.
-The rivals' interactions are way better than Sinnoh.
I think that Ash vs Kotetsu will be a very good battle. Other thing is the league himself.