I must say, I don't find it nearly as entertaining as previous seasons. One of the things that I loved about Fringe was the parallel universe. It made the show fun in a way that 2036 is not. Plus the approach to the observers seems strange to me. I assume that they are from a parallel future, otherwise why attack their own past? I must say, I never saw the Observers as neo-facist nazis.
I miss the fun weirdness from the earlier seasons. Plus, really, how many times can you mess with Walter's head?