Also, might I say I love both the opening and the ending of season 3? Because I do. I loved the ending of the first season and liked the opening as well. But the second season was a downgrade for me in everything. But in the third season, I think they made up for it. The opening is spectacular since I adore the animation style. The ending is not anything amazing, but I love the style they went with, so I love it. (FYI; When it comes to opening and ending, my focus is on the visual more than the actual song).
I'm not one to think 'too little too late' when it comes to shows. If I like it, I like it. There is no point holding grudges for a lackluster season.
Besides, to me, it seems like they took the criticism from season 2(or maybe understood it would only hurt their reputation/pocket if they tried season 2 style again) and did season 3 justice. There were some amazing, stunning, and beautiful moments of animation too. I have seen that animation style before in another show -as well as in the opening- and would be happy to see it again. it's just stunning.
I do think the season could use more episodes to delve into the charecters and plot more since some moments of character and plot points did feel a tiny bit rushed. This was the season with the least episodes in it after all. But it's not too bad, and it did feel more like they did the best with what they had rather than whatever happened in season 2 where it felt more like a money-grab effort after the success of season 1. I don't mind money grabs as long as it does not feel like one.
Season 3 felt like animators were allowed to put some special care and effort into it, something I felt lacking in Season 2 (Season 2 had some moments, but it just did not stand up to the standard season one set in any way). And if season 2 was the 'setup' season, I was satisfied with the result that came from it in season 3. But season 3 does not have a satisfying ending. Keep in mind that season 3 is also more of a lead-up to season 4. I think it has been confirmed a season 4 is coming, but not too sure.
So to summarize: I honestly think it's sad to see the recommended/not recommended being so 50/50 here. Season 3 deserves better I say.
Season 2, while not great, was alright. I personally think season 3 was close to the first season(but it does lack some parts I hope will be filled with season 4) based solely on my own personal enjoyment. That is my honest opinion. So I think if you liked the first season and want more, getting to season 3 is worth it. But it will not give you a satisfying end, just a lead-up to the next season.
So far the seasons might work better as one show rather than season by season when it comes to rating, so I am looking forward to seeing how it all will end.
