Couple issues...

GPS tracking slightly inaccurate when biking or jogging.
Golden razz berries are severely underpowered on wild Pokémon.
Raid incentives are underwhelming.
Retrieving rewards from gym pokestops is really time consuming.
I think its still a great game but those are reasonable things to adjust in the next update!

Skinny_Herb about Pokémon GO, v1.39.0