Gym system and raids still quite buggy and in need of fixes, and Stardust is a horrible system now more than ever, but I assume these will be fixed in time. Main problem Im not seeing fixed is the lack of expected content in in-game player interactions, such as pvp and trading. Hopefully Niantic can figure out how to put these items that shouldve been in at launch within the game soon.
ISporE about Pokémon GO, v1.37.2