Stay with it matbha.
Like others have said, there are some episodes where it goes backwards a little, but it really is all worth the watch...
It's a shame you're reading this thread, as it clearly gives away a few of the plots.
But plots they are.
Incredible really how the zombies become second...
I never thought I would be a fan of a zombie based series....ever.
I hadn't watched a single minute of a single episode until mid February, when my misses at last managed to persuade me to give it a go.
I've now watched all 7 series in around 12 weeks.Having a bit of time off work helped...