tl;dr: oneplus has the highest emissivity

OnePlus 2: nearly a year to get marshmallow even though it was out shortly after release, completely abandoned
http://www.ibtimes.co.in/its-official-oneplus-2-will-not-get-android-nougat-update-will-this-dent-oneplus-5s-appeal-730306

OnePlus X: same story, company never spoke of it again. And the marshmallow build is also incredibly buggy

OnePlus 3T: in an effort to restore the reputation they discontinue a 3 months old phone, launch this on a 14 month old OS, and they already announced the last OS update will be the one released 10 months after release.
https://forums.oneplus.net/threads/software-support-for-op3-3t-questions-answers.599122/

"How to release your kernel sources"

Xiaomi posted a poll about MIUI vs Stock Android and everyone voted for Stock Android, then they deleted the poll from shame
Carl Pei from OnePlus decided to do the same thing to show Xiaomi he had loyal followers of OxygenOS.. going well for them so far /s

Someone should have told him not to delete his Tweet

Friend's 1+3t turned off, doesn't turn on, doesn't charge

so my friends OnePlus 3t that died yesterday

Turned on normally

And other people who had this problem

Said that it turns on after few hours-days

Lmao

classic fuckup:
https://www.reddit.com/r/Android/comments/2odez1/this_is_oneplus_ask_us_almost_anything/cmm5cum/
OnePlus claims that yellow screens in the OnePlus One are "not quality issues, and are not covered by warranty"

Classic Fuckup:
OnePlus sells dodgy USBC cables: https://arstechnica.com/gadgets/2015/11/oneplus-admits-that-its-selling-dodgy-usb-type-c-cables-and-adapters/