One of the things I think with the subject is that, it is a bit problematic and odd that people look at the sport from the lens of National Team instead of players.
I like to see good play. When two players are competitive with each other, I like to watch. When one player is significantly better than the other, it is not as interesting to watch. I feel that is the case with lower levels as well as the top levels as long as the players in the match can play. So, even with decent club level players, if there is a match that is a good contest and you are not sure who is going to win for a decent amount of the match, it can be fun to watch.
But of course, when two of the best players in the world are playing against each other, and they are fighting toe to toe, that is quite often epic and poetic.
If you remove the idea of national teams and which country/team a player is from, the issue in this thread becomes much less of an issue. In Tennis they don't spend countless hours talking about which country a player comes from. The players that stand out, stand out. Their nationality may be mentioned on occasion. But it does not become a central focal point. Nobody is talking about how Serbia is so good regardless of how good Djokavic is.
This has to do with how table tennis is structured as a sport. But I just try to ignore it and like to watch good matches. When a match is an obvious blowout, which does happen a lot in TT, I am not sure it is worth watching.
Why are there so many blowouts at the top levels? Because TT is a game of levels. If you are one or two levels above someone you are playing, you can beat them easily and the win can look bad or ugly. And the players at the very top are really just fundamentally so much better than everyone else. They are trained right from a young age and have thousands of more hours of table time with good coaching and superb fundamentals. So, it makes sense they are better. But I don't really care what country they are playing for. I know. But I try and watch the play rather than watching the flag.