Constant Gardener is good - Our Kind of Traitor & A Delicate Truth are well-made disposable fiction.
Indeed. And no, Murder of Quality is a passable runaround. Absolute Friends is his worst novel.
Constant Gardener, Delicate Truth and Our Kind Of Traitor are all odd: if I told you "here's a shlocky thriller for NS readers"...
...you'd go, "Oh, these are good fun". But because they're Le Carrés, we find them disappoointing IMO.