You know, i've been around here for a while. I have quite a lot of stuff from Spitfire and now also the Arks, after the latest sales. And all i see is some users say OT string shorts are rubbish, Spitfire string shorts are rubbish, Strezov Afflatus has phasing issues, Cinematic studio strings not realistic enough, etc etc. So i kinda wonder, what all these people consider as good libraries.
Partly it's an internet thing. Once people get going it can become a dogpile very quickly.
I don't know who complains about CSS. I mean it's still limited to certain areas because it's a sample library, but all CS stuff is some of the most consistently performing of all the libraries I own.
Of course these libraries sound great and you can make very good music with all of them. I recently wrote a piece with the Arks, CSS, Berlin WW Revive, and Berlin Percussion. A handful of longtime working professionals were shocked to find out it was all samples.
No library is "perfect" - they can't possibly do it all, and the more specialized a library is, the less it can do with ease. However, there's specialized, and then there's sloppy work.
The issues that plague the Arks are mostly a result of just being sloppy, where it's 100% clear QC was rushed, or people just don't care to tighten things up, or they
literally did not even look at sections of their own product/update before release.
As a result of these undisciplined practices, their uses are negatively impacted. Detrimental? In some cases yes (Ark 2 mid string tails were bad enough that I would not use them in most situations). In most cases, not absolutely. But they become limiting or require a deal of editing, coverup work, or general jiggery pokery to hide. This impacts overall composition choices because if left exposed these problems would reveal themselves quite explicitly.
Samples will never be "perfect" because they're fundamentally different from live performance. But when, as a result of what appears to be laziness or oversight, basic uses become problematic or even impossible, criticism is completely acceptable.
OT is getting dumped on because they released products with some glaring issues, and then didn't fix some of those glaring issues when they finally did an update years later.