I wouldn't quite rate it as highly as some have online, but I do agree that 'After the Wedding' is a great film!
It took me a little while to warm to this but eventually I had a positive time watching it, it even manages to pack a more emotional punch towards the end... it genuinely had me feeling sad for the characters. The flick probably overruns slightly as it could've reached the aforementioned conclusion quicker, but that's a very small criticism.
Mads Mikkelsen, Sidse Babett Knudsen and Stine Fischer Christensen are big performers throughout, credit to all three of them. Rolf Lassgård is, however, the star of the show in my opinion - a top notch performance, particularly for the crux of the plot. I felt his character's emotion.
I did almost agree with many others online by giving it around 9/10, though I settled on 8/10... it's not far off, I admit. Either way, and more pertinently, it's a film that holds quality.