Movie Reviewers should not be expected to read the book

A bit of a rant here.
On Scifiwire, a posted review of Harry Potter and the Half Blood Prince movie stirred a few negative comments because the reviewer admitted he had not read all of the novels.
This is wrongheaded.
A movie should stand or fall on its merits, not on the merits of the source material. It is somewhat beyond the point how the movie relates to the source material, and its definitely beyond the point if the reviewer has never read the source material.
Should a reviewer of Total Recall be required to read the Philip K Dick story it is tangentially based on, for instance? Is reading Pride and Prejudice necessary to review the Bollywood remake Bride and Prejudice?
I say no. While its a nice benefit and addition, in the end, the movie should stand and fall on its cinematic triumphs and lows, not on how it relates to its book. My issue with the movie Troy, for instance, was not the liberties taken with the narrative of the Iliad, but rather the make up of the universe and the blatant anachronisms.

An Ant empire the Romans or Genghis Khan might envy
A single mega-colony of ants has colonised much of the world, scientists have discovered.
Argentine ants living in vast numbers across Europe, the US and Japan belong to the same inter-related colony, and will refuse to fight one another.
The colony may be the largest of its type ever known for any insect species, and could rival humans in the scale of its world domination.
While ants are usually highly territorial, those living within each super-colony are tolerant of one another, even if they live tens or hundreds of kilometres apart. Each super-colony, however, was thought to be quite distinct.

And according to the article, its probably the fault of humans, for carrying sub colonies of the original population throughout the world.
Genghis Khan, Augustus Ceasar and other potentates in history can only envy the extent that this ant colony has managed to spread across the world.

Canada Day

Happy Canada Day!
I’ve only been to Canada three times:
The first time was with my family on a trip to Niagara Falls. This trip was noteworthy for the Station Wagon we rented with the weird mushroom smell and my older brother dangerously speeding (so much that the speedometer went “beneath the dashboard”). While in Niagara Falls, US, we decided to briefly jump over to the Canadian side and see the falls from that side too.
The second time was my 2007 visit to Jasper, Banff and Waterton Parks in Canada with My Friends The Olsons™.
The third time was just this past April on my own personal trip that led me to Thunder Bay.