Not going to lie, I can see the points of some of the comments, but the coaches are what makes the show. Banter and drama is needed to increase tension and suspense.
I actually LOVE the Voice Australia though I first watched the Voice US. The coaches in AU are much more honest when training with the singers. They're incredibly invested and I just didn't see much from the American version. The coaches actually disagree with each other when they believe that it was a wrong song choice, for example. It is so amazing to see Delta Goodrem bring singers from her team with her on tour.
I live in North America and I am shocked that professional singers like Delta and Guy are not well-known here. Before I started watching, I had no idea who any of them were. Now, I'm a huge fan of their music.