It is my second favourite film of 2014 so far (the first being Whiplash). Brendan Gleeson and really every other member in the cast is brilliant in it. Ireland looks beatiful, the film looks a lot more expenisve than you would think given the low budget. The drama is intense, but at the same time their is this great vein of dark humour running through the story.
If you have any affinity with Ireland or the Catholic Church, the movie gets even better. Not to say that this movie has an overly religious message of course. Atheïsts and believers alike should love this film. Calvary does use a lot of symbolism related to the Passion. You can watch Calvary without that knowledge and it would still be great, but you'll get even more out of it if you're remotely familiar with it.