Arthur is more fun and amusing than actually laugh-out-loud funny. Russell Brand delivers jokes non-stop for about 90 percent of the film and he's always right on the mark.
Brand is charming as the drunk Arthur, who acts and sounds like a five-year-old child, not a grown man. He is known for playing outlandishly silly characters and has pretty much hit the same mark with his performance as Arthur.
Arthur is a billionaire who is heir to a corporate empire. He isn't taken seriously by his family as he acts like a spoiled child and doesn't offer anything to the business. He spends most of his time throwing away money and getting into mischief, along with his nanny Hobson (Helen Mirren), who must clean up the mess.
His mother presents him with an ultimatum - marry businesswoman Susan Johnson (Jennifer Garner) or lose everything. With the prospect of becoming poor and having to find a job, Arthur agrees to marry the woman, even though he doesn't love her. Soon after agreeing to marry Susan, he meets and falls in love with Naomi (Greta Gerwig), a working-class girl from Queens who has dreams of becoming an author. He must choose between his love for her and his love for money.
Brand is his usual charming and hilarious self - he delivers his one-liners with quick wit and a cool confidence. Brand and Mirren balance each other perfectly and their witty banter is extremely amusing and fun to watch.
Mirren herself plays the part well and has enough energy and charisma to be convincing in her role, but not too stuffy to be unlikeable. The entire film is a huge party of fun and has the audience amused from start to finish. It is fun to see a grown man find so much pleasure in the simple things and shows just how much trouble you can get into with unlimited funds.
Although Garner departs from her usual girl-next-door role and she does a fairly good job as the domineering and catty Susan, she isn't completely convincing. Maybe she's typecast herself too much or she just has too sweet a look to pull it off, but there was just something missing.
Greta Gerwig is charming and sweet as Naomi, but she is overshadowed by the strong personalities of Brand and Mirren. She isn't a fair match to Brand's Arthur and the relationship comes across as insincere and forced. These are two people who would never be attracted to each other in real life and it doesn't work onscreen either.
Director Jason Winer tries to throw too much emotion into the film three quarters of the way through and it's hard to believe since Brand is so convincing as a mindless, self-absorbed drunk. He isn't convincing as a man in love with anyone - the chemistry between Brand and Gerwig just isn't there.
Overall, Arthur provides a funny look at a man void of any responsibilities and regardless of if you are a fan of the original Dudley Moore Arthur, you are going to find enjoyment in this one as well. It doesn't try replace the original film, it merely took all the good bits and placed them in a different setting.