I think the difficulty with the "season" format is that they often turn into soap operas.
The first season is always where all the good ideas are, often to the detriment of further seasons since they don't know from the off if a second or third season will happen. Ratings. Hannibal, for example, was awesome! But they had rejig the timelines for the second and third seasons because they'd achieved the timeline (of the films) in that first season. Alternatively, sometimes you just want more and more of the same in that universe - Fargo, for me, just got better and better.
Back to Killing Eve ...
Season 1 - really good. Season 2 - a bit meh! Season 3 - really could not be bothered. Mrs thought it the best of the three, though. Go figure.