I think Warframe is a good game that should have ended a long time ago. The core concept was done years back and all they are doing no is attaching whatever ideas they can sort of fit in, in a hope it will continue to keep the game alive.
Case and point, look at all the aspects of the game that have been implemented but get little to no attention in the years following it.
PVP - Trends were for PVP MOBAs at the time, and so they stuffed in PVP. Its always been a shitfest that a handful of people played. Many people think its the least played part of the game, its just the least played part you can remember.
Lunaro - Remember that? most people forgot it or never even heard of it. It was an attempt at something and it failed to take off, because like PVP, it was halfbaked.
Archwing - DOA and after a few attempts to get it working, they sort of gave up and it sees a little play in ShiteJack as a transition method. It, again, was half baked and did not fit the engine, but it was never given a chance anyway.
Sharkwing - An attempt to fix some of the problems, and a justification for its existance. The Arch shit really did die, and it gets dragged out to remind people to actually level an Archwing from time to time.
RailJack - What a fucking abortion, one which is already floating into the ether as trying to build a space sim fighter inside an already buggy 3rd person looter was a retarded idea from the get go.
Kubrows - They never knew what to do with them. They thought "hey a buff machine" and rather than fix that, make Kavats. That failed, what about a fighter that can borrow abilities, Helminths. Never fix anything, just make new, and fuck that up.
FrameFighter - Another PVP attempt, another failure. No one plays this mode, it was a shit take on beatemups.
I could go into the piss poor weapon balance, the fact that melee has always been king, most new frames just being a combo of old frames, the Operator being forced to be used in Eidelon hunts as a new timegate life sink, but its all the same.
PoE was a mess, but they listened to us gamers guys! they fixed the balance of the grind. 4tuna was a mess, but they listened to us gamers guys! they fixed the balance (sort of) of the grind. That new openworld? Is it a hot mess of shit grind forcing players to do boring, halfbaked pokemon shit? of course it is, its wank and most people know it. Each update, more people leave, each update just pushes them further into the grave.