This episode more than earned it's title. The hits just kept coming and coming. That by the end I was a little puddle of tears and snot.
There were many brilliant touches. While the use of the humans to manipulate the Autobots has been done before they have never been used when the fate of the whole of Cybertron hanged in the balance. When Optimus made his decision to save Earth? I freaking Kermit flailed because of how awesome that little scene was. Optimus is so my favorite (always and forever!) which is why the end of the episode had be sobbing like my heart was broken. And seriously, panning to show his arm in the wreckage... now the show is just twisting the knife. It's in! I'm already dead of heartbreak, stop trying to reduce it to pulp!
One of the creepiest bits in this episode was Megatron's glee over Optimus destroying the Omega Lock. It's his home planet too and his happiness is freaking disturbing as all get out. Ugh. *shudders*
A great episode. That's the way to do a season finale.