Children of Men is certainly one of the best films of the past 10 years. Its a brilliant film.
First of all, these statements here are, themselves, debatable. But that's not what THRILLHO wrote. THRILLHO wrote that it was
the best film of the decade
which, frankly, it isn't. It's a good movie, but it's not the best movie of the last decade.
It may be the best post-apocalyptic, science fiction movie of the last decade, but even that
is debatable when you consider movies like the Road, District 9, and I Am Legend. Even to some extent Sunshine, though that could be differentiated by being principally set in space.
All that to say this: Children of Men is not the best film of the last decade.