Indeed.
Look, filler programming isn't going to have "This is Us" level viewership. So sure, if you're comparing top in-season shows to summer-season shows, the comparisons would look pretty ugly in most cases. But they're also the proverbial apples-to-oranges, and nothing any person with an actual stake in the business is going to pay a darned bit of attention to.
ABC in particular had a need for some relatively inexpensive, flexible programming to fill their summers. For a bunch of years things came and went, with a few snagging a second season here or there. Then they start building off Celebrity Family Feud, and find themselves with a night that's successful enough to not just come back more-or-less intact several seasons in a row, but they expand it by going back to the "classic game show" well for a couple of new shows to build a new night. In the meantime, they used Match Game as in-season filler as well, several times now.
If that's your definition of "bad," you're off the mark in terms of how the business works.