Almost every Disney villain imaginable turns out to be cooler and much more lovable and funnier than the protagonist (having really awesomeVillain Songs probably helps):
Hades from Hercules. Roger Ebert even said Hades brought, "something of the same verbal inventiveness that Robin Williams brought to Aladdin." In addition, he's such a fast talker he got The Fates, Megara, and Hercules himself to obey his whims, all while being a Card-Carrying Villain in the whole process.
Honest John and his sidekick, Gideon, from Pinocchio have one of the coolest songs in Disney history: "Hi Diddle Dee Dee".
Who was your favorite character from Fantasia? If you responded anything but Chernabog, the towering demon on the mountain from the end of the movie, your pants are now on fire.
The Leviathan from Atlantis: The Lost Empire. "Evil" is perhaps a bit debatable, but it kills a staggering number of people onscreen for a Disney movie. Also: it's a giant Magitek mechanical Kaiju shaped like a lobster, with a Wave Motion Gun that can split battleships in half, and is estimated to be several miles long.
Yzma from The Emperor's New Groove is arguably the most entertaining character (with the possible exception of Kronk) in the movie in her own right, completely setting aside the issue of the protagonist being (intentionally) less than likable. And if her initial Villain Song, "Snuff Out The Light" had ended up in the film, she would've been bumped up even further. In-universe, this trope itself was lampshaded by Kronk's Shoulder Devil, who promised to lead Kronk "down the path that rocks!"
And, if you consider them to be truly evil, Shenzi, Banzai and Ed take this trope Up to Eleven. They have a dark, sinster design, look very badass (even if they aren't much), provide great comic relief, create good chemistry, and take down the villian themselves. Oh, and Shenzi is quite popular among furries. Interestingly, the 1995 TV series tones them down to Loveable Rogue territory, as if the creators realized how they were being received.
The villain of The Princess and the Frogbreathes this trope. Dr. Facilier (voiced by Keith David) is a nasty piece of work: powerful, scheming, persuasive, stylish, charismatic, and he has an awesome Villain Song. He's an amalgamation of previous villains like Ursula and Jafar, as well as Michael Jackson! Now this is following tradition!
Judge Claude Frollo from The Hunchback of Notre Dame has not one, but TWO heroes to overshadow. It helps that he has probably the most audacious and amazing villain song ever, and that neither hero is really interesting enough to stand up to a character with as many layers as Frollo. And then there's Tony Jay's voice. Frollo seems like an attempt to subvert this trope, though. Instead of being a Card-Carrying Villain, he is a self-righteous, genocidalKnight Templar. Instead of being some wisecracking Evil Sorcerer (like a LOT of their villains are) or some macho hunter (like Gaston and McLeach are), he is a skinny, old, prudish, religious judge. One cannot help but wonder if they saw people root for Scar and the hyenas, thought "wow, they rooted for some power-hungry dictator who murdered his own brother? Let's give them a villain they couldn't POSSIBLY root for!", and created Frollo...but upon witnessing the Misaimed Fandom, gave up and created Hades.
This trope is the whole reason animators Frank Thomas and Ollie Johnston wrote their book The Disney Villain, which covers the creation and thought process behind the Disney foes from Peg Leg Pete up to Jafar. Over 50 of the Renaissance era Disney animators actually asked them to make the book, and decided "Sure, why not?"
In Rango, this is the reason behind Rattlesnake Jake's popularity. The Rule of Cool runs very high for him; he's a black hat rattlesnake western outlaw modeled after Angel Eyes, he weaves words of hellfire and damnation into his speech (which is provided by Bill Nighy), and has a Gatling gun grafted onto his tail. He's Creepy Awesome and Crazy Awesome all rolled into one!
Pitch Black from Rise of the Guardians. He's extremely creepy, he has a sympathetic motivation for his actions, and he has an army of literal nightmares.