The game has some issues but most games do when they come out of the gate. Its the price we pay for games that are more involved then just jumping on Koopas and picking up coins.
The game is perfectly playable and outside of some balance issues has no really gamebreaking bugs in it. Other games have not been so fortunate, GTA V didn’t work, Skyrim and dragons flying backwards, Destiny was…well…still not fixed but that’s a bad example.
Give them some time to balance things out properly. I have no idea what their internal mechanisms or benchmarks are for making changes but if it were me I would be waiting until a significant portion of their player base were competing at max level and see how the end game is playing out.
Getting owned by a Wraith when your new to the game and sitting at level 2 is what you want to be balancing for.
And be thankful that they at least come here and communicate and seem helpful, that is miles ahead of the support some games give you.