K... finished the entire series last night. Finally going to read the comments I skipped earlier lol
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EDIT:
Doing it Right ended the series properly for me. I really enjoyed the entire series, but there were a few issues with the last novel I just wanted to address:
Using Davey as the primary perspective for three books and then suddenly switch to Brian was interesting. But the last chapter was written in an outside observer point-of-view, which is understandable considering the unstable state of mind of what Brian had to deal with. It was just a very awkward shift for the very last chapter.
The main issue with Let's Do It is that it took Dan 20 chapters to get Brian started and then in eight chapters the span of three lifetimes occur. It just felt extremely rushed. I would have loved for the entire Russia setting and experience elaborated more. The treatment of Brian after the fact
of how he got there, how bit by bit he began breaking down, how his personal will towards the United States, his secrets, and his friends did break while his will towards Davey never broke, why that was, whether the details of the Do Over technology was properly recorded and enacted by the Russian Colonel who became interested in the technology, and
Since Let's Do It became a shifting perspective novel, I would have liked to see how Brian was at last sent back in time, the details involved with obtaining, researching, and enacting "the last act" to make things right.
The other main issue I had with Brian in particular was that Davey was so careful and calculating with every detail in initiating change while assuming a greater moral compass as much as possible, while Brian, even after multiple timelines, still had no reservation about sending not only himself, but his friends to essentially have free reign on the effects and consequences of time travel. I just feel that when all of Brian's friends got to go back after essentially betraying the government officials of the United States in that particular timeline, that the importance of the security of the time machine was cheapened, and the sense of duty to make things right became more and more of a slippery slope. While I agree that the driving force of Davey was his sense of duty to his country while Brian's driving force was to influence indirectly the greater good in the world, there are multiple decisions that I personally would have loved Davey with multiple timeline experience to somehow be able to evade jamming (such as him getting into the bubble after Brian and Sean went back in time when the bubble collapsed temporarily or was able to use the same signal that wasn't able to be jammed to be sent back. It would really be nice of Davey was allowed to issue some direct influence to help make certain decisions that would ultimately avert the mistakes made in Let's Do It.
And I guess if Dan decided to write a fifth novel to continue the series, I would really like to see if they could get Brian to recover, rebuilding his life, getting a grasp on things.
Let's Do It was an interesting sequel, but until I see a better "ending" to tie the series up, I really see Doing It Right be the right ending to the series for now.
Thank you Dan for write such wonderful series such as Do Over and Rich Boy, I really look forward to reading the rest of your published works on here and hope to be able to read more material from you soon.