In addition to what has been said and I agree with (though my favorite Gold Digger is the original one)... wow, it'll take a while for me to think and remember...other than microgames from the original WarioWare, I can't remember most of them from top of head. I should rather find a list to recall them more quickly. Okay, a long time later, done in the comments below.
Disliked:
* The Orbulon one in the first game where you had to spin some gears to save a little boy. It was funny when you lost and he screamed, but it always made me try to think too hard and not enough time.
* The one in Smooth Moves with the silly papery sumo dudes (one of them was a Wario and looked funny). The controls were unresponsive...
Liked:
* "Super Wario Bros." from the original: I laughed just so hard the first time I played it.
* Wario Whirled. I remember the name because it was so funny when you failed and Wario fell off.
* Dungeon Dilemma. I just love its mockery of very old RPGs, and the music is just so silly and catchy.
* The Jimmy Ski microgame from the original. I just loved to fail and see the little dude roll down the mountain.
* The Jimmy acrobatics one where you jump on a trampoline and land atop of a group of swimming dudes. Failing is hilarious to me in there because of all the buildup from jumping and bouncing pretty high.
* Pretty much everything 9-Volt, except those bandit/gun ones. Special mention to the one where Link picks the Master Swords and becomes an old man or a cuckoo.
* The KatAna one in the original where you're one of the worms in a puddle and must get to dry ground. The concept is funny, and I like how the worm becomes all happy and waving its head with music notes around it.
* The KatAna boss microgame in the original. Was really fun and had cute music.
* The Jimmy karate chop one from the original, because when you fail, the dude's hand goes red and he lets out a funny scream.
* All of the DriSpitz ninja ones in the original, because the silly music always made me laugh.
* The Crygor one in the original where you're a bunch of silly realistic-looking people impaired by GBA graphical limitations and you must keep a watermelon bouncing (I especially love the first level where you bounce the fruit with a dude's belly).
* The Crygor one in the original where you must match the vegetables, and winning gives them very silly faces.
* The Wario Anything Goes one in the original where Wario is a cockroach and must push a golf ball into the hole. It's such a crazy and hilarious idea.
* Pretty much everything involving noses.
* Pretty much all transformation ones. I especially like the DriSpitz one in the original where failing turns you into a pig, and the one in G&W where one of the "heroes" you transform into as an elephant man.
* KatAna's boss microgame in Touched, because the little dude you control in it is hilarious.
* Pretty much all of the microgames you make as jobs for Wario in D.I.Y., and you get to use your first silly designed creatures.
* Pretty much everything involving Fronk. But moreso than the Fronk games in Twisted, I highly enjoyed the Orbulon one in the original where you have to pick the right Fronk, and they all have silly faces and wear funny clothing.
* The Mona one in Smooth Moves where you make pizza!
* The one in G&W where you flick some little crazy dudes from D.I.Y. away from a vinyl disc.
* The Jimmy one in Touched where two funny hairy dudes tickle each other.
* The KatAna one in Twisted where a monkey evolves ...into a robot.
* The Crygor one in Touched where you need to adjust an analog clock that has ...a nose in its middle.
* The KatAna one in Smooth Moves where you give an old lady a denture and she eats a lot of stuff.
* The Ashley one in D.I.Y. where you have to pick some fruits, and there are some ugly fatasses whose butts look like peaches.
* The Wario-Man one in Twisted where Wario's Adventure Wario must dodge bird poop.
* The Wario-Man one in Showcase where you eat pizza from a Wario-themed plate, and it contains ...metal slices that you can't eat.
* The Mona one in Smooth Moves where a dude drinks water and it makes him grow afros and become bulky!
* The Penny one in Smooth Moves where you control a robot that picks trash via remote. I dunno, it feels good to help.
* The Mona one in D.I.Y. where you must crush cans... but you may also end up crushing a cactus.
* The Wario-Man one in Twisted where Wario is a worm going to get some fruit.
* The Crygor one in Twisted where you need to catch a floating face's drool... and it blooms into a flower.
* The Mona one in Twisted where you use ...clothespins to force some funny green dude to eat.
* The G&W one where it presents situations that are similar to other microgames, but you're supposed not to do anything. The results of failing are especially funny in the cactus one.
* The Wario-Man one in Showcase where it's kid Wario's birthday and you must put the number of candles on his cake according to his age. It's hilarious because he's a kid, yet his mustache is fully grown.
* The KatAna one in Smooth Moves where you're some hilarious green Nosepass dude and have to wave in like a bunch of silly kids.
* Ashley's boss microgame in Smooth Moves: it always made me laugh so hard to put all those crazy ingredients in a sandwich.
* Wario's Adventure. The music is badass, stick figure Wario is funny, and I love how the great treasure at the end is poop.