There ARE good things about Galaxy 2.0, I won't pretend otherwise. That said, there are a lot of basic expectaions for the functionality of a game launcher which are met by EVERY competing platform (except in a limited number of cases, Steam, which is a nonfunctional trash heap and/or a literal health risk for some users and has spent almost a week locking some affected users out of access to the only functional workaround for the problem).
So, what's missing?
-EITHER a light mode OR a high contrast dark mode, if not both. GOG's low-contrast dark view looks great for some of us, BUT is blatantly non-functional for a significant number of vision-impaired people. These conditions are not often going to impair the experience of being a gamer outside of attempting to use this client.
-Sorting by purchase date. This isn't the biggest of high-priority features, but it is a reasonable expectation to have of any STORE-BASED platform, at least as a tool for sorting their own games with. And the fact remains that it exists in every competing launcher INCLUDING every prior version of Galaxy.
-Connectivity between existing tags through the website and prior versions of Galaxy and the new client. You may have been ok with your 100 games. What if it was 1000? Some people do have libraries on that scale with tags sorting their purchases. And YOU being fine with this doesn't mean that the next guy with only 50 games in his library will be. This is a subjective judgment that IS fair to hold against Galaxy 2.0 as a poor design choice.
-Literal access to games owned on the platform. This is absent in a number of cases. People are finding that Galaxy 2.0 is failing to display games they own on GOG - also doing the same at times for Steam, but that's a third-party plugin, not GOG's own work. Their own platform is losing track of its own game databsaes. THAT is a serious problem. And it was known about in beta and not fixed for the launch of Galaxy 2.0 when there is no excuse to launch it in such a state.
-Proper respect for a pre-existing and still present "opt out of beta testing" option. This option existed in Galaxy 1.2 and remains in 2.0, but users who have opted out of beta testing have been AUTOMATICALLY UPDATED to the Galaxy 2.0 BETA which is directly identified by the company as still being in BETA but is NOT respecting user choice in opting out of testing.
On top of those, Support is functionally absent right now. They have, since WELL before they forced Galaxy 2.0 live while openly admitting it's in beta, known that they are experiencing massive delays in support response times (noted as being up to 4 weeks, but I have multiple tickets past even that limit). This was the absolute least sensible time they could possibly have chosen to launch a new platform and force it onto their user base.