I don't know how I felt about the ending. It was pretty basic, but I loved the credits videos.
Somebody mentioned how she became a princess, so here are my thoughts:
Zelda became a princess because her and somebody else (implied to maybe be Link or Groose) stayed on the surface and kick started Hyrule. Obviously, they would be in command, therefore King and Queen. Why all other Zelda's are considered princesses when some of them don't show any hint of having parents anymore is beyond me.
OoT: She's obviously a princess here because she makes reference to her living father still on the throne. As adults, I'm thinking her father is Rarau.
WW: She's pointed out as the descendant of Zelda, but she's only called a princess by the King of Red Lions. Probably out of respect for the bloodline, as the monarchy seems to have died out (or any sort of government, for that matter).
TP: She obviously is in command. She should be considered a queen, but I think there are some royalties of the past (maybe even still) that only consider a woman to be queen if she has a king (which could also explain adult Zelda in OoT). I don't know...
All the others explain themselves pretty well, I believe. Even if it's only hidden in the manual (NES two).