Saying this before the spoilers start coming: Please, use spoiler-tags.
Anyway, Dragonball's ending was pretty rushed.
! It pretty much seemed like Toriyama went "Meh, I'm tired of writing this, I'll just have Goku run off to train Uub, even though they only met ten minutes ago. THE END." Though honestly, this ending COULD have worked, but it was just so sudden. It didn't really feel like the end of the entire series, more like just the end of an arc in the middle of the story…
I fail to see how that was rushed. The "10 years later tournament" was meant to be an epilogue, a bonus that most series doesn't have the time/patience to deliver. One can say the real ending was the victory against Buu.
And still, Goku clearly stated how he was waiting for the reencarnated Buu to show up since their battle years ago. It's not like they casually met at the tournament, Goku was there just to meet him. Seeing how Uub was still leagues away from Buu, Goku takes him way to train and the series goes full circle.
It's anything but rushed..whether people like it or not is subjective, naturally.