The Caretaker by H Pinter

I just listened to this on Radio 4. A tramp is rescued by 2 brothers one with a brain injury and the other who acts like he deserves one. The tramp, while trying to be independent ends up being friends at different points with both the brothers until the end when they fall out with him.

My initial thought here was, if this is Pinter's best play, where was the epiphany or denouement? What was he trying to say? What was the big idea? Or did the critics just rave about it because the were educated at Cambridge and thought it daring that this working class sort of thing was entertainment? Yes the language was realistic, yes the revelation that the brother had been given EST was interesting and explained much but as in a tragedy we sort of knew as an audience the tramp would be out on his ear eventually. Have I just been de-sensitized by all this @in yer face' stuff?