Millions of people like TWD but this gets no love?

No. When it first came on, it was amazing - an ACTUAL ZOMBIE TV SERIES!!! The idea, I gather, was to see what comes next. The films always end with everybody dying or else going off in a helicopter into the sunset, so let's have a TV series which doesn't end then.

Well, what TWD did was demonstrate just why the films end when they do.

There are zombies, so an awful lot of people die due to zombie bites, being eaten and so on.

Then we learn the lesson that we already learned with every zombie film ever made - the living are more dangerous than the dead! ZOMG, it's a surprise every time!

So we have a hard core of original survivors who gradually get whittled down due to zombie bites, zombie dining or evil living people. Occasionally a new character or three joins, and once in a while one or two of them has enough charisma to become a "main" character.

The zombies (called Walkers, or Biters, or Rotters, depending which group we're dealing with - one of the few innovations being the variety of names) become less and less relevant as our regulars confront random bad guys, then the evil-for-evil's sake Governor, then more random bad guys, then some cannibals, then a bunch of people who kill for no reason and have a W carved on their foreheads, and (most recently) the utterly tedious Negan, who singlehandedly lost the series five million viewers.

As hinted earlier, a "main" character is killed from time to time. Unsurprisingly the shock effect diminishes each time. The real kicker, though, is that there isn't anything else. It's literally a case of seeing how long each character lasts before they're inevitably bitten or eaten or murdered.

The Girl With All The Gifts is very different. It has ideas! It has a new perspective on the zombie apocalypse! It has characters with understandable motives. It has interesting imagery, and nice touches such as not knowing which of several zombies will respond to noise.

In short, I've come to love TGWATG (both novel and movie) whereas I regret the time I wasted watching TWD.

This whirlpool's got such seductive furniture
It's so pleasant being drowned

This isn't making you reflect on human nature??? This is probably the first movie to make me ask myself "Do zombie lives matter?" and almost definitely the only show where I was interested in the quest for a cure. It never ever works out, but it's still interesting here to watch these humans survive and try to balance finding a cure for everyone else with their own survival.

I've never seen personal survival vs species survival as an actual theme. Even the "evil Sargent" is a practical real person who you want to survive.

This is hands down, beyond the shadow of a doubt the most mentally stimulating, thought-provoking zombie production ever made. If you're looking for an adrenaline rush, well no, you won't get it here, but this is still an excellent zombie movie.