Much better than I remembered, sequel number three is a fairly gripping film up until the last third. At which point, it devolves into a well lit but rather laborious extended fight sequence.
Ricardo Montalban is hugely sympathetic, Don Murray decidedly not. Some significant logic holes present themselves. If many, the Governor included, are concerned about the apes' potential wasn't it a bit foolhardy to take them on as pets, particularly when the death of cats and dogs rather emphasised Cornelius' prediction of the future? And it seems unlikely that anyone would risk training gorillas. But the rather grim totalitarian feel of the piece works very well.