It is easier to criticize the boxer after he has lost, however, none of the analysts have said anything about that before the fight and have said to bet on the Ukrainian because of that record. Also, who has Usyk fought before Anthony Joshua? Many of the are also not great names.
Are you speaking about Usyk opponents in heavyweight or in cruisersweight? I can speak for cruiserweight - Usyk has beaten everybody who were top1-top3 places on boxrec. Bellew, Briedis, Mchunu, Huck. Of course his heavyweight opponents were not from top. But they were like a warm-up.
I am not criticizing Joshua, but Usyk was a very inconvenient opponent. Southpaw. Joshua never experienced a southpaw of such a high level, as well as he has fought against a southpaw only once. It was a natural and expected loss.
I do not think it was a expected loss as you say because if you looked at the odds before the fight everyone thought that Joshua was going to win convincingly and by knockout. The gambling websites even had Joshua winning by points at better chances then Usyk. I agree with you that Usyk is a difficult opponent for any one and not just Joshua but saying it was the expected result is not accurate imo.