You are not the only one. I don't understand why such a big deal was made of Hera or what point the Opera House served (literally as well as metaphorically). The Admiral going off to live alone was pointless. The idea that Kara came back to lead them to Earth -and- another Earth, which happens to have the coordinates of the notes of an inspired song, is ludicrous.
The ending showed that it wouldn't have mattered if the colonials were wiped out at any point during the series. Most of them will die in short order, all of them will have their life spans drastically reduced. The cycle wasn't broken, there was nothing left over to learn from so that humans wouldn't repeat their mistakes.
The ending made the entire series seem worthless.