So heres some factual stuff:

The director of the episode has never done a sherlock show. The writer for this show was a combination of both writers (Steven Moffat, Mark Gatiss), instead of one taking each show in their own direction like the first and second episode did.

Other Notes: If Eurus Is so "Crazy" why was she able to be "normal" enough to have multiple sessions with John as his therapist, or as E on the bus?

Why did she run back to "prison/sharringford" after she "tranquilized" john?

It's clear that she wished to be forgiven/reconciled with her brother, which is why "miss me" was everywhere, and moriarty started picking on sherlock/watson.

--- Why then is she nearly mauling sherlock after she lounges on him and attacks him out of her fake cell? (then calmly says, no a few more minutes?)

She claims that she was "not a prisoner of her own flesh, because she was too clever".

But so clever that she went straight back to prison? (plot convenience).

Also If she really wanted forgiveness/reconcilliation/help why bomb the three people who could have helped with a drone and almost kill their landlady?

If she were really much cleverer than mycroft, she would own the secret service and the UN, and merely have led mycroft believe that he controlled the roost.

In that would have been a better story, but alas, the writers wanting to make a "one-time only" special wanted to take a genie out of its box, and put it all back in again, so that the timeline would not be obscured by this sherringford/eurus sibling.

What would have made more sense, is if moriarty had been working for her and he was merely one of many shitstarters around. Whereas Mycroft and Sherlock were good at playing chess, She would be the master at playing GO.

To be really reasoning, truly thinking beyond the level that they played up, she would need to seem almost 4d, while even one else was as 2d as a sidescroller game caught up in the rules of systems that they cannot fathom or escape from.

Yet the writers took the easy way out and said that she was so smart that she was crazy, that's why we jack in the box'd her.

I understand sticking to the book somewhat, but remember that Doyle's times are not like ours. I would have appreciated it if sherlock were flown back to handle a crisis only to handle small family matters.

There were notes I enjoyed, but this episode felt like a "made for tv" spinoff special.