It makes me sad saying that, especially considering that "Wonderland Story" should really have been a good episode. Have never gotten enough of Munch, his dry humour, wry one liners and wild conspiracy theories and he did deserve a good final episode that fully utilised him. Especially with him being so underused for so long (Richard Belzer's health was the main reason from understanding), where there were too many episodes where his screen time is too little.
"Wonderland Story" could have been a lot better. There are far worse episodes of 'Law and Order: Special Victims Unit' and of Season 15, but "Wonderland Story" was one of the bigger disappointments. With it having a promising idea and that it was also saying farewell to a beloved character (or meant to, as this aspect for me was not done particularly well and two major things being done differently would have made it better).
There are good things. Photography and such as usual are fully professional, the slickness still remaining. The music is used sparingly and is haunting and non-overwrought when it is used, and it's mainly used when a crucial revelation or plot development is revealed.
Furthermore, it is a very well acted episode all round. And the ending is beautiful and from the heart.
Unfortunately, for me the case was too thin and predictable and has too little tension and atmosphere. Which made it feel dull. It's also an inferior episode and a big problem when the characters one is supposed to be rooting for are not rootable at all, which was the case with Sophia here. Later seasons did this aspect of unsympathetic victims worse, but still. The dialogue lacks tautness and only in Munch's dialogue is there much spark.
Particularly underwhelming is how Munch is used. For a farewell episode, this did not feel like one because there is nowhere near enough of Munch. "Wonderland Story" would have been a much better episode if it was a revisiting of a past case that he himself worked on with him playing a substantial role in the solving, an extended cameo doesn't cut it.
Overall, watchable but should have been better. 5/10.