[Enkidu of Abydos]

If you've read at least one of the series that is...
I chose these 3 because all 3 are famous humoristic novels, though the first is much less well known than the other two, and also the first two are both fantasy themed (and have other similarities).
I want to find out why the first one is so underappreciated, as far as I know, and why Discworld is so popular with them being similar...

My favorite (of these 3) is the first, by far.
The third I find completely stupid and dull, and can't understand why it's so popular. I don't dig it's Monty Python style humour at all, and I didn't find Monty Python very funny either, although most of my friends like it. Humour is definitely a matter of taste like everything else.
The second is fun in general, but it has TOO MANY books... The world and the characters are briliant, and the first book was fun for me, but most of the others were pretty dull (that's why I haven't read most of the probably 30+ books)... Again this is much more popular then the Myth series with my friends...
I've read the first 12 of the Myth series, the ones he wrote alone, while I still plan to read the ones he wrote together with Jody Lynn Nye. Why is it my favorite of these 3 and one of my all-time favorites ?
Because books #1, #6 and #9 (and add to these 3 the parts with the D&D parody and the dragon's viewpoint !) left me in stitches from laughing, and the others were highly entertaining... Though it does waterdown a bit towards the end, like everything else. I found the one with the vampire cows and the golden city pretty stupid, but that's the only one.