I saw the first two episodes and the redone intro suuuucccks, it felt flat and very flash-animation like and the reworked theme sounds like a cheap videogame midi cover, hated it.
Thankfully that's pretty much all my complaints as the show itself is fantastic and I really enjoyed every minute of both episodes so far! I was really worried just by the intro that it the show will be cheap, lazy and full of nostalgia bait but that's not the case at all. Although they could use less of the "Me, my X-Men" line since that's so lame.