I agree that "Ex Machina" wasn't very good.
Well. in the words of President Bartlet, you can just sit there and be wrong in all your wrongness.

Diane Carey's Final Frontier. In terms of continuity there are what I believe inconsistencies in terms of detail, but I liked her sense of setting and her take on the characters. I could do without her Jim Kirk's emotional crisis framework scenes because I don't think it's in Kirk's character and the rest of the story works well without it. And it had (at the time) what I felt was a fresh way of doing an "unofficial" first voyage for the E under Captain April.
Now, this I agree with totally. I didn't really mind the framework, but I don't think the book needs it, and I've always wanted to see this book done as a movie or mini-series.