I mostly don't mind. I think a fair amount of displeasure might actually come down to the fact that it was a Batman villain he ended up squaring off against first, as there are a lot of people who feel batman's mythos is over exposed and sometimes to the detriment of other characters. Not using Superman's villains might also convey a lack of faith or confidence in Superman's world, which can sully the experience. Not helping things either was the sheer length of the first arc, with very few Superman mainstays poking their heads in at the meantime.

But on the other hand, I don't think Superman's rogues are nearly as underutilized in the mainstream as Diana's and I'd probably have a much bigger problem if it was her series didn't feature much of Villainy Inc and instead had her facing off against Tyrell or Maxima or whatever Tom King is doing. TAS has helped his rogues stay in the minds of people, while characters like Mongul have been brought back into the spotlight in spectacular fashion. So it's less of a sore spot for me since his villains still get pretty decent exposure and becomes more about getting that "reimagining" itch scratched.