The main issue I have with the game right now is the economy. Due to the large influx of new players over the past few months nearly every farmable item has decreased in price. Just a few examples would be Everstones 20k > 8k, Heart Scales 11k > 6k, Big Mushroom 12k > 5k, and nearly every RP based item dropping as well.
I don't mind saving money and waiting for the PvP meta to improve or more end game content to be added, but when making money is as painful as it is right now, it completely turns me off from playing. And unfortunately there is no easy solution for a broken economy like ours. I suggested buffing NPC rematches again but they didn't like that idea so I guess we just have to sit here and wait for these updates they keep promising us.
As far as the competitive aspect of the game goes, I can't really give much of an opinion on that. I've been waiting for a year now to get into it but half of the things needed for a healthy gen 5 meta isn't available to us, so I chose not to waste money breeding things that I'll need to rebreed again later. (Again mainly because of how painful earning money is.)
One of the things that still surprises me is the lack of updates we receive from the Dev team. (Not actual game updates, but updates on what they're doing etc.) I mean, They spent how many months/years working on the Unova region and they didn't even make an official announcement when it was being released. We got a shitty teaser on Kyu's profile and that was it. Biggest update of the year and they didn't make any official announcement on the forums or social media. That example alone should tell you how little effort they put into telling us what's going on. Putting a little bit of effort into your community would go a long way.
I can't relate to some of the issues competitive players or shiny traders have, but I guess this is my opinion as a 'casual' player on the current state of the game. The game is really stale right now and the only thing keeping me around is the social aspect of it. I've spent 2,300 hours of my time in the past 15 months here and it's just sad that it doesn't seem like things are improving any time soon.