As much as I liked Vile Bodies, Waugh's other books just leave me cold.
There is wit, and then there is spite. Waugh just somehow doesn't seem to be able to rise above the latter.
Yes, there are some fine caricatures, but what spoils them is that Waugh tries too hard at times and comes across as nothing more that a bitter and self-important cynic.
I have one other of his books but it just moved down (quite) a few places on my TBR.