A lot of them aren't popular but I'm sure not everyone hates most of them as much as I do. 
For me, the Lion King II is hands down the best. 
 

Lion King 2 was my absolute favorite movie when I was a kid, so... Lion King 2.

Then again, I also loved The little Mermaid 2 as a kid and that movie is pretty bad lmao. But I rewatched Lion King 2 a few years ago, and it was still fairly decent. Or maybe it’s just the nostalgia, who knows.

ralph breaks the internet

The Aladdin ones (and the series) were the main DTV sequels that I liked. King of Theives for KH4 please?

I have always defended Lion King 2 when people dump on it, and I still strongly believe that it is one of the better Disney sequels. The animation is great (though not as great as the original), the songs are great, the characters and story are good and not just a rehash of the first one. I love it.

My Top Five Favorite Disney sequels are...

1.) The Lion King 2

2.) The Little Mermaid 2: Return to the Sea

3.) Aladdin and the King of Thieves

4.) An Extremely Goofy Movie

5.) Beauty and the Beast: The Enchanted Christmas

Lion King 1 1/2 is my favorite Disney sequel.

I'm a little sad Mulan 2 isn't on the list, that one is my favorite. 

Somehow I grew up watching Extremely Goofy Movie more than the original Goofy Movie. Go figure. X)"