First, to answer your question, very few.
However, if we broaden to 6.0, more than you think. As in, every flagship of note from 2014. S5, One M8, Moto X 2nd gen to name the big ones I actually looked into. So, it's not as bad as you think for other OEMs, and those OEMs, while not on 6.0.1, got to Marshmallow much faster than OP, which completely breaks one of their big marketing points.
Plenty of people are well aware of how awful OEMs are at updating their phones.
Those OEMs don't talk big about their software game, though (except for maybe HTC with their update tracker site), and those same OEMs don't have taglines like "2016 flagship killer" for their lackluster 2015 devices. They don't try to convince you that "you didn't need NFC anyway, look at how much we don't settle!"
OP (as in OnePlus, don't want to bring thread OP into this by accident) brought a heavy ad campaign, and literally over-promised by a LOT. And you are getting offended that they're being called out on their stupidly late Marshmallow delivery? To the OPO's credit, it's the closest OP ever came to delivering on their marketing hype.
I'm glad you're happy with the devices you own. If you were one of the lucky that got a non-yellow and working touchscreen, that's great. If it wasn't for these hardware issues and a largely absent customer support system, the OPO is still a good device. I don't deny that at all.
That has no bearing on how annoying the company is, how off-the-mark their advertising has been (like Never Settle has ever applied to their devices even once), and how terrible their customer support is.
I have a N7 2013, and at times the touchscreen issues are infuriating. I won't ignore that about the device. I'll just point to the price, and say that I'm still pleased overall with the device. I don't use Apple hardware or take part (heavily) in their ecosystem, but at the same time I will continue to be impressed at the consistent quality of their hardware offerings.
You may overall like the OPO. Fantastic. What do you gain by attempting to convince me? Is my hardy dislike of the company and their shenanigans affecting your devices and how you use and enjoy them? Does my opinion on how much they did and do settle all the time have to be changed before you can enjoy your devices? I'm not deriving my opinion from the ether. I want the Nexus line to have some real competition. None exists.
They deserve the ire over the delay to Marshmallow. They're 7 months late on the initial release, let alone saying a single thing about monthly security updates, and N is already in the hands of the public. This is only going to snowball for OP unless they make some changes, fast. This is the sound of setting.
EDIT: Forgot LG G3, also on 6.0.
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