I loved Season 4 the first few eps where good to get back on track the final story of the governor was good as well and the end episode of Part 1
I liked how they placed it all together in Part 2 too and how they focused on the characters in each ep, S3 was also good since they where all over the place and meeting new people for once
S2 just felt boring to me and only had like 4 Good eps and they where the first two and the last two
S1 was amazing for a first season