Brian told us to post our feedbacks. So here's mine.
What follows is a reflexion on my experience with Ingress over the course of several years. I have been playing since beta, although I don't have the Founder badge since I didn't make it to level 5 by the end of it. I'm not very active anymore, but I thought I could provide a bit of useful feedback. Hopefully someone from NIA reads this.
I'll start by talking about the moment when things really started to change. When Niantic Labs became independent from Google, they seemed to stop taking Ingress seriously and somewhat "admit" that it's just a game. The website nianticproject.com was abandoned, the Ingress Report was discontinued, and the story's characters stopped posting their own updates on their Google+ profiles (well before the platform was shut down). Now it feels like the characters' only role is to be present at Anomalies so that players can get the corresponding medal, if they pay for it, without even actually meeting them in person.
Overall, Ingress does not have a solid backstory anymore, but just some sort of lore on the side. Anomalies don't seem to have a real impact on its progress, and their mechanics don't always reflect the storyline's events.
When it comes to the app itself, I feel that Ingress desperately needs some rebalancing of its core mechanics through a buff/nerf approach. Over the years, many items were introduced to the scanner which never received any additional tweaks, which resulted in the loss of some original mechanics. For example, the introduction of Power Cubes made it completely unnecessary to collect normal XM from portals (more on that later). Another imbalance was generated by the introduction of levels 9 to 16, which made it extremely easy to reach Level 8, and L4 Resonators are now a rarity because most portals are over L5. Levels are now essentially divided into two parts: the first half (L1 to L8) is a tutorial while the second half (L9 to L16) is a grind which only rewards agents with extra bragging rights.
Finally, and most importantly, the gameplay flow feels less and less thoughtful. Too many portals are either low-quality, mislocated, or way too close to each other. This quickly breaks the player's immersion as they perceive Ingress as yet another generic AR game, and not as a "real" XM scanner that can manipulate the world around them. In the first couple years of Ingress, every single portal captured was an achievement. It was genuinely challenging to gather enough resources to take down a portal before running out of XM. After every battle, you had to walk to collect the XM flowing out of portals, hacking them along the way to refill your inventory before attempting to take down your next target. This was a slower, but extremely engaging type of gameplay, that actually reflects the way Ingress is marketed in the trailer videos. Today, however, agents can simply fire a few hundred L8 XMPs in a place with a high portal density and fully deploy everything in 15 minutes, only to have it all taken down a couple of hours later by someone else. This has become quite boring, repetitive and grindy, and made me love Ingress less and less. Your actions as a single agent feel significantly less impactful than they used to.
Luckily, the community is still great and it's the reason I still play Ingress from time to time. The core itself needs some reevaluation and reworking. What I am playing today is a completely different game from what I was playing a few years ago.
Thank you for reading. Remember, this is just my opinion.