Well I say this about any movie and I think it will always hold true. We all like different movies and sometimes a movie that can be pretty popular may just fall flat with one of us. I said I did not enjoy the Superman movies I saw growing up and I know that some people found that to be odd.
The only way I can say that might help you connect with the movie is to think that you're seeing a Polynesian Jew playing Hitler and that much of the movie revolves around the imagination of a child. I watched it from that perspective. I know I mentioned this years ago in the thread about the movie and that I got to hear Taika Waititi speak about the movie. AMC had this thing on opening night and it had some screenings at the UWS location by Lincoln Square with a sign saying Q&A. I asked about it and was told that someone associated with the movie would come out and talk about it after it was done. They had a screening the next morning for a Q&A of the movie so I got really lucky and the AMC app finally showed an open seat for it in the front row. At the end of the movie we are all surprised to see that it was Taika who came out to answer questions for 30 minutes. One random guy yelled out "Heil Hitler" (Recurring theme in the movie, especially with the Heil Hitlering scene later on in the movie with Stephen Merchant playing an SS agent) and Taika's like "Wasn't expecting that this morning!" I still have 15 minutes of video on my phone I took from that.
He explained that he did the movie to warn about nazis and that they were again on the rise and that he was, in his words, "I should have to be making a movie warning people about nazis 75 f****** years later, but here we are." Again not everyone likes every movie and I think that's normal. This one just really hit home with me for several reasons, especially because my Oma was six years old when that idiot came to power and she turned 18 in January of 45 while her country was being destroyed. Just watching it through the eyes of a child who knows nothing else, but hate yet finds a way to change in the midst of unimaginable sadness perhaps makes it hit home more.