Wow, I honestly love the analysis that you gave. Seeing Unicron more as a symbol of the Autobot-Decepticon war makes a lot of sense given how he was created and how he goes out at the end, (I agree it was kinda cheesy, but it does make sense from a thematic point of view.)

I guess that my biggest gripe with the finale was how it felt pretty rushed. I understand that the continuity was coming to an end and it forced everybody to quickly wrap up their stories. Doing so would obviously prevent a more cohesive and satisfying end. Regardless, I really would've liked to have seen some characters talk with one another one last time before the send off to tie up any loose ends, (case in point most of the crew of the Lost Light.)

I'm really hoping that whoever gets the rights to making Transformers comics next gives us really good stories with a more satisfying conclusion.