I was never a fan of The Little Mermaid (its just not my thing, especially the music), but the TV series was decent enough to sit through a few random episodes on late night TV when I'm bored. The Aladdin TV series was pretty good as well, though not on the level of Darkwing Duck; Duck Tales; Gargoyles; etc.
I had a chance to watch Little Mermaid 2 via VHS a few years back (my mother had gotten a lot of old VHS tapes from a friend who was just dumping them off), and I thought it was stupid but nowhere near as bad as say...Return of Jafar. The music, though...*shudders*. The only good thing I can say about that movie's music is that it's nowhere near as bad as "Swim this way" from Kingdom Hearts 2. *shudders again, more violently* Speaking of that game, that un-used song used for the battle with Ursula in Kingdom Hearts 2 was actually pretty cool and well-integrated into the fight.
Suprisingly, I actually liked the direct-to-video Lion King 2. The music was pretty decent and the story interesting even if it followed a pretty tired cliche.