Seems like a silly reason for mistrusting reviewers. The audio issues were only on certain audio tracks, and only on a few episodes. That's an easy thing to miss when you're trying to evaluate a 26-episode release on deadline.
It's not just this Trek release. I can't count the number of times I've bought a high-profile video game that got 9/10 on the review that turned out to be buggy pieces of shit.
Better to trust people that aren't counting on relationships with the companies producing the material and drawing site traffic.