Well, when Variety is writing:

With a circus parade of mourning Brits and enough appalling circumstances to set proper Englishness back to the Dark Ages, "Death at a Funeral" pits decorum against sex, drugs and dysfunction. The winners? Auds who know you laugh hardest when you're not supposed to, and who appreciate the humorous qualities of embarrassment, blackmail and the twitting of the upper classes. Box office will likely be modest, but reaction will be strongly positive.....
You have to wonder is this might be worth our time. Modest box office is term used to describe many movies I love, so it's all positive for me.

Of course, some people might not have forgiven Oz for the Stepford Wives remake.

Synopsis:
Frank Oz's first feature since his "Stepford Wives" remake stars Matthew Macfadyen ("Pride & Prejudice") as Daniel, the type of Brit who can't decide whether to mourn his father or be embarrassed -- death, after all, is such an inconvenience for everyone. Daniel is indecisive by nature: He's promised his wife (Keeley Hawes) that they'll soon move out of his mother's (Jane Asher) house, and that he'll finish his years-in-the-writing novel. But it looks doubtful.

When the undertakers bring the wrong body to the house, Daniel nearly expects it, since the whole affair is shaping up to be a disaster. Not helping matters is his brother, Robert (Rupert Graves), a successful novelist who was born to drive Daniel mad with envy. As it turns out, Robert is the least of Daniel's problems. Soon he finds himself with a second body to dispose of, while his mother grows impatient with being cheated out of the dramatic spotlight.
OFFICIAL SITE

And poster: