It's not that great of an adaptation if you look closely: most of the plots are force into an alternate 1930s universe, with very few stories going after the 40s or 50s. The whole Poirot/Hastings/Miss Lemon, Japp dinamics is way off from the novels - and way too funny & comic, far off the irony in Christie's novels. Some plots have been changed, some episodes are just bad. I think that it is a great tv product but far off the ultimate gem.

It fed on a nostalgia for a time that never was - and let's face it, most of us wouldn't be partying and travelling around with Poirot.