This really shouldn't have lasted to 3 series. After all just how far can you stretch the simple premise? Alan is divorced and, having been taken to the cleaners by his ex., goes with his young son,(Jake),, to live at his wealthy brothers,(Charlie), Malibu beach house.
Alan is an obsessive about everything, his son jake is a typical booger eating little boy & Charlie is a serial womanizer & all round self centered git.
So how come it's lasted? Well there's the scripts for a start. Not only are the set-ups for each episode funny but the dialogue is razor sharp & on the ball. Most of all though it's the performances that keep this going. All involved delivery their lines with great timing & even though it's all too far fetched the characters are believable & easy to like. The one performance that stands out is of course Sheen's. His character Charlie is a reprehensible swine with no morals & a selfish disregard for anyone else. He should be totally unlikeable & yet Sheen gives his character a likeable charm & easygoing style that makes him hard to dislike.
The plots are really wafer thin & you never really see the character arcs or anybody's situation move on or grow. But it remains sharp & funny. Alan's neurosis continues to trip him up at every turn,(the episode where he becomes like his brother in the company of a rather well endowed woman is hilarious), Jake is moving into his teens & is packing attitude while Charlie at first appears unchanged.
This isn't for everyone, if you like your plots deep & gripping then this is going to be like a paddle in the shallow end. The innuendo & sporadic swearing,(which has increased in this series), will be off-putting for others. But if you have enjoyed the previous 2 series then this is highly recommended. it should be tired by now but somehow all involved keep this show funny & worthy of repeated viewing.