Personally I thought the finale was fine, the big screwup this season was the battle with the Night King and the army of the dead. It was all meaningless spectacle. Other than Arya's final kill-shot none of the fighting actually made any difference, it was all a waiting game for the Night King to tell his troops to stop so he could go attack Bran personally. That apparently would have happened regardless of whether the Dothraki were massacred, etc. In a well-written story the things the characters do matters, but in that episode most of the characters could just as easily have stood around doing nothing and gotten the exact same result. Since the show has been building up the threat of the White Walkers since the beginning it was a bad choice to have that plotline resolve in such a weightless manner.
Where are the Dothraki going? What about the unsullied who were in control of King's landing. How of many unsullied remain after the war with the nightking? Could they have outnumbered the forces of everyone else.
It's implied that the Unsullied are sailing with Grey Worm to Naath, Misandei's homeland. I think there were originally a few thousand Unsullied in Danaerys's army. Presumably some have died in the various battles they've been involved in, and then there was some dialog in one of the episodes this season that 50% died in the battle with the Night King. They are unlikely to outnumber any of the Westerosi armies. Also, the strength of the Unsullied is in their highly disciplined fighting style on the battlefield, when they're trying to occupy territory they don't seem dramatically better than anyone else (e.g. they were getting picked off in Meereen).
what was that about Bran saying he doesn't want to be the kind but then saying "why do you think i'm here?"
I think they're trying to highlight the difference between wanting to be the king (ambition) and willingness to do the job (duty). He's doing it because he believes he is supposed to, not because he has a personal desire to be the king.