Joss Whedon’s Avengers sequel loses much of the original’s exhilarating freshness. It begins in the middle, doesn’t really end, and regularly makes you wonder just how long the Marvel box-office bonanza can continue. The moment when its Cinema Universe’s exponentially growing complexity slams into entropic reverse, as happened to Stan Lee and Jack Kirby’s original comic-book vision, is plainly visible on the horizon.

If A Pigeon Sat on a Branch Reflecting on Existence induces reflections on the nature of existence, the resultant mood could initially be very glum indeed. Swedish director Roy Andersson’s meditation is the self-declared “final part of a trilogy about being a human being”. It opens with three vignettes focusing on unexpected deaths and is, overall, grey in tenor. It is also, though, laced with humour and a very precise eye for changes of mood, the subtle differences between each of us and the tenderness which can bond even those who seem directly opposed to each other.

Poised vibrantly enough between the buried-alive monotony of Philip Glass and the dynamic flights of John Adams, Steve Reich’s Three Tales deserves a special place in music-theatre history ("opera" it is not). Ironically, since it deals with the two-edged sword of the 20^th century’s major scientific developments, the video work with which the music interacts so brilliantly – by Reich’s former wife and long-term collaborator Beryl Korot – has been left looking a bit dated by rapid progress in that field since its 2002 premiere.

The pupils at a girl’s school are afflicted by fainting. It’s spreading. A teacher is affected too. The epidemic began after Lydia and Abbie's friendship has irrevocably ended. Lydia became the first to faint. The school’s headmistress, Miss Alvaro, is determined to ignore what’s going on and ascribe it to baseless hysteria. The stern teacher Miss Mantel is equally unyielding. When medical examinations are finally undertaken, no causes are determined. Lydia is isolated and then expelled as a Typhoid Mary figure.

Taiwanese director Chienn Hsiang has given his lead actress Chen Shiang-chyi a role of rare complexity in Exit, and she dominates this bleakly naturalistic slice-of-life film completely. Chen’s character, Ling, is a seamstress approaching middle age, living an isolated, alienated life with rare distractions – hardly dramatic material in itself, you might think, but the film’s accretion of small everyday events, seemingly insignificant in themselves, comes together to capture a slowly compelling sense of character and milieu.

Remember the Hitler diaries? Stern and the Sunday Times were so eager for them to be true they went ahead and published even after historian Hugh Trevor Roper had changed his mind about their authenticity. Such was the hunger for stories about Nazis. It’s still there, but Die Welt was on firmer ground when – to accusations of sensationalism – last year it published extracts from the cache of letters, diaries and memos in the hand of Heinrich Himmler.

"There is no murder in paradise" is the official line of the authorities in 1950s Russia, but nevertheless Child 44 is the blood-drenched tale of a hunt for a mass-murdering paedophile in Stalin's deathly shadow. The source novel was the first in Tom Rob Smith's trilogy about Russia during and after the Great Dictator, and Smith based it on the real-life killer Andrei Chikatilo, the "Rostov Ripper".

We’ve waited 33 years since Peter Greenway’s The Draughtsman’s Contract for another film combining romance, intrigue and 17^th century landscape gardening. Now we have one, and it couldn’t be more different.

Boasting one of the most appealingly eclectic casts in recent memory, The Salvation – from Dogme 95 director Kristian Levring – might have hoped to emulate the success of Sergio Leone's Italian-infused approach by bringing a Danish flavour to traditional western proceedings. But by relying too heavily on the tried and tested it fails to distinguish itself, meaning that the "smørrebrød" western seems unlikely to replace its spaghetti cousin in audience affections any time soon.

The burden of responsibility weighs heavily on a young man struggling to deal with his mother’s alcoholism, in Gerard Barrett’s powerful and poignant second feature. Jack Reynor, who so impressed in Lenny Abrahamson’s What Richard Did, turns in a nuanced and moving performance as a son driven to desperate measures in order to survive. Barrett empathises how difficult it can be to get by when you don’t have a regular income, or indeed plentiful cash to throw at your problems.