Operators mainly, I have no interest in any of that shit which means I have no reason to do most of the new stuff they keep adding. I did like that they removed the terrible "raids", but what they replaced them with (as far as arcanes go) was even worse. I have every warframe (minus a couple newest primes, and I wouldn't take Limbo Prime if it was free) and that's the game I want to play, not this clunky shit mode that has a terrible daily grind that I refuse to participate in even though I have the ideal Equinox setup for it.
Basically I have nothing else to do except farm a couple hundred thousand endo, 400 at a time.... so even though I still really like the core game, yeah I'm not doing that either.
I got about 1500-2000 hours of fun out of the game though, so I'm not exactly complaining as much as I'm disappointed that I can't find any reason to play it any more.