I prepared for this review by re-watching Olivier's and Branagh's Hamlet films, and was fascinated to find I prefer this TV production from 1964, filmed under what must have been somewhat difficult conditions (the electrical work had to be done by the BBC, as one reviewer notes). I found Christopher Plummer's performance to be more convincing, more felt than those of Olivier and Branagh. Olivier seems to be fascinated with his own athleticism--that trim body that can do anything he demands of it--just see how he leaps off the platform in Act V to stab Claudius. Plummer on the other hand hasn't got the athleticism but he is better able to unite intelligence with feeling. I was more moved by his 'Now might I do it pat' after Claudius starts praying than by the other versions because of Plummer's occasional clumsiness.
The other actors are fine: Alec Clunes really plays Polonius as a prating old fool (just as Hamlet describes him) and Robert Shaw is tremendous as Claudius, virile and crafty and sexy. You see why Gertrude has to fall for him. Michael Caine is ardent in a part that calls for just that quality and little else. He handles the accent fairly well.
Only two actors don't do well: June Tobin is stiff and shallow as Gertrude; her range doesn't allow her to really play the bedroom scene effectively. Donald Sutherland seems to play Fortinbras as a foreigner whose English is shaky.