I used to hate this movie a lot (And I mean, a lot) but nowadays I have started to see its good qualities.
Terrence Malick's films are not everyone's cup of tea, and this is not only not the exception, but probably the most extreme example of that at display: There are many qualities from this movie that are frankly admirable (Particularly its brilliant cinematography and performances) but it is also the kind of movie that is quite tedious to watch at moments.
And it's already a pretty long film, it feels even longer than it actually is.
If you are about to watch this, don't expect something like "Saving Private Ryan". Expect something more akin to Apocalypse Now Redux: A brilliant, but also tedious movie that is both beautiful and both tiring at moments.