Season 3 Part 2 was very well done, as someone who reads the manga and loved that particular arc, I can see why anime fans were so hyped about it. The fights were excellent, the consequences felt natural without the usual BS in this genre, and the titan origin reveal was very well done, making use of foreshadowing throughout the story without feeling too obvious either. There are a lot of manga adaptations I watch where I find myself critiquing the adaptation in my head over and over, and thinking "Would I enjoy this more if I didn't read the manga?" With Attack on Titan, I don't think that thought ever crossed my mind...it's basically an ideal adaptation for anyone who enjoys the source material.
Not sure if I'd put it in my all time favorites list though...I have various issues with the overall package that makes it hard to compartmentalize one 10 episode span of time. The side cast is treated kinda poorly, the plot can move pretty slowly, some twists are handled kind of awkwardly, and because the author doesn't make use of facial faults, some scenes intended as jokes feel more uncomfortable than funny. Overall though, I can certainly see why a show like this would make waves like it did, and I would say it definitely deserves the success its seen. Just hope the final arc is handled well now.
Agreed it was very very well done it surprised me so much and cemented itself as one of my top animes.
Well hopefully the issues you had will be resolved in final season and i'm confident that it will be one for the history books.. maybe it will even end up on your favourite lists.;)