I think the key to cringe humor is it really needs an audience. Michael Scott on The Office doing a Chris Rock routine he really shouldn't be is funny because he's surrounded by people who realize that it's inappropriate but does it infront of them with gusto. Most of Kuroki's fantasies stay in her head, and it's kind of a point of the show that she's so isolated nobody notices her, but the funniest bits are when somebody does notice she's doing something weird, and those moments are fairly rare. There's a bit where she makes herself out to be her idea of "pretty" and a couple kids are horrified and a couple bits where her mom walks in at the worst time and those tend to be the funniest, but otherwise it's mostly her weird thought and they are amusing, and she is a great character but there's never quite those moments that completely catch you off guard.
That said, it is still a fun watch. I watched the dub version which I tend to do with comedy and I thought the voices were great and fit the character. I loved her weird little noises she makes and the broader sound design was pretty good. I think the funniest recurring gag was actually some of the music tracks they play when certain things happen, there this one sort of mystical Indian chanting that sounds like something from Akira and it's really funny when it kicks in and she's having a moment.
Visually the show is somewhat average. Tomoko has an expressive and memorable design, but most of the background NPC's are your stock anime character template designs. There are some good cutaways that play with style and one really awesome shot in the finale, but I think it's more the weird design of the protagonist and her strange expressions that carry the show visually.
I think they could have pushed the concept more, but it was still a good time for me. I'd be interested in watching another season to see how it goes or picking up the manga but I feel like I wanted just a bit more from the show.
