I see that this thread is quite long, so I will just say that I am in the camp of those who find OGS difficult to understand without studying the documentation, and even the documentation is not always complete or easy to use. In my case, as a user of OGS for several years, I will even state that accomplishing something new in OGS (such as downloading SGF files containing game analysis trees, or turning off the suggested numbered move patterns provided by AI review) is typically so unintuitive that I have to post on the Forum to find the answer.
You can see corroboration of my experiences right here on the Forum by the many postings and lengthy threads asking how to do simple things in OGS. I believe that if OGS were intuitive most of those postings would not exist.
Note that I’m not complaining about the bugs in OGS. I’m sure they are being tracked and prioritized, since it has been stated here that the developers are overworked. I’m only referring to how this site is seen by newcomers, that is, the design of the interface.
While some parts of OGS are superb, such as finding a game, getting a ranking, the beauty of the displayed board, the nice click sounds, and making moves with a mouse if one has sight, other parts of OGS seem awkward, such as the initial specification of the parameters for games one wishes to play (example: you can choose Fischer time control, but how to choose the three timing parameters for Fischer is a major problem). Even finding one’s profile can be a challenge, even though there are three ways to do it! And it is not at first obvious that a list of all played games with links is right there, in the profile.
And for strong newcomer players, the fact that they cannot provide an initial ranking is an unfriendly hurdle that they don’t experience with most other Go websites. Imagine a 3 dan player having to work their way up from an initial assumption of 25 kyu (I’m guessing here). Ugh, I’m imagining that would be tedious for the 3 dan, and unfair to all the opponents along the way!
Don’t get me wrong, I like OGS more than IGS or KGS, for many reasons. But being a friendly interface for playing Go for newcomers is not one of them.