The speakership of the Commons tends to be appointed on the basis of Buggins' Turn. Which is fine until there is a crisis, when a second-rate speaker will be exposed.
Michael Martin was not up to dealing with the scandal over MPs expenses: now Lindsay Hoyle has been exposed by his failure to deal with Boris Johnson's contempt for parliament.
The best speaker I can recall is Bernard Weatherill, who combined wisdom with old-fashioned courtesy and had no wish to be a "character". He served from 1983 to 1992.
There was a story about him that I have long known, and now I have a source for it I can post it here.
Peter Viggers, then the Conservative MP for Gosport, told it when the Commons was paying its tribute to Weatherill after his death in 2007:
For a while after the election of every Speaker, there is a period when the House wonders what kind of stamp or mark they will put on the House, so for a few weeks after the election of Mr. Speaker Weatherill the House was wondering how he would be as Speaker.
During that period, there was a vigorous debate - it was a noisy event - and a very much loved, popular Member on the Labour Benches, Eric Heffer, was in full flow.
If Eric Heffer had a fault, it was that he had a bit of a temper. He was being baited mercilessly by one of our younger whippersnappers on the opposite side of the House. Eventually, Heffer completely lost his cool, spun round and shouted, “Shut up, you stupid git!”
From the Chair, Mr. Speaker Weatherill said, "Order, order. I think I’m meant to say that."
