Don't be discouraged by the official review. FalseDawn analyzed this movie as a stand-alone piece, which is a flawed starting point, since UBW is irrevocably tied to it's predecessor: Fate/Stay Night, hence his analysis is plain...wrong.
The whole movie moves on the presumption that the viewer is already accustomed to the FSN universe. That's why I didn't find its action or character development rushed. Actually, I enjoyed the movie mainly because it didn't drag on like the TV Series.
The plot itself is set on an alternate world and many of the character's roles are changed.
I won't write much about the actual movie but I will say this: if you enjoyed Fate/Stay Night and/or Fate/Zero then give this movie a chance and I'm willing to bet that you'll also enjoy it :).