Critics tend to get more notice when they hate something. And it's usually painfully easy to toss out jabs at things, especially if there's even the tiniest possibility that someone else will take up the hate call.
I'll just add my couple o' half-pennies on the sketches that you noted that you haven't seen along with my take on it - WARNING - SPOILER GALORE BECAUSE HIDING THEM WOULD BE KINDA POINTLESS FOR THE LENGTH OF THE REPLY. Sorry in advance...
Darkwing Duck - that was part of one of their Michael Moore 'documentaries' about 90's characters that seem to have fallen off the grid. Gossalin [Drake's little duckling niece[?] ] turns out to be sick and needs medical attention. The only way for Darkwing to get enough money for her is to sell himself to a Chinese restuarante. I honestly took that as a dig at the rising costs of medical care and how it's getting to the point where you're almost worth more dead than alive to pay for this kind of thing. It's something I can relate to first hand because I'm still paying for my jaw surgeries years after the fact and because the initial costs of being in the hospital for my heart were so much, I haven't been able to go back for anymore check-ups. Just bite the asprin and hope that if I collapse, it's someplace I'll be found before I start to turn to goo.
The Joker getting executed - this is a skit where the Joker gets caught by the Batman in an abandoned building and gets his arse royally kicked in. But Batman stops at what could be the killing blow because that would be crossing the moral line and instead announces that he's taking the Joker to jail. At which the Joker replies that he'll just get out like always, go on another spree, get caught, go back to jail, rinse, repeat ad nauseum. So Batman goes to court himself and gives the ultimate testimony that gets the Joker the death penalty. When a prisoner is put in ol' sparky in real life, a wet sponge is usually placed between the skull and the helmet to help ensure that the electricity conducts as quickly and as painlessly as is possible considering you're being electrocuted. But the execution goes wrong because it turns out that both Commissioner Gordon and Batman have made sure there was no sponge and the Joker fries for a very long and painful moment because of it. Again, if I had to look at this as something other than wish-fullfillment [who hasn't wondered why the Joker has never gotten the death penalty? Insanity can only carry you so far ] I took this as a dig at the revolving door system of the prisons and the continued failure to do anything about those criminals who have proven beyond a shadow of a doubt that there is no such thing as rehabilitation.
The audience suicides at STOMP - people sitting in a theater while people beat the hell out of trash cans and anything else they can make noise finally realize that they paid money for something they wouldn't even allow in their own homes. Turns out that the repetitive noises of people stomping out of the theater and getting a refund or just plain killing themselves are almost more musically rhythmic than the STOMP presentation. When I saw that skit, what I thought of was how sometimes following what's popular is the only thing that makes it popular. Lots of people go to shows like STOMP because the critics loved it, not because it was actually anything mindblowingly new. They pay money [and lots of it] for, as one person in the skit noted "something I can watch my kids do at home for free" .
The unfunny Harry Potter sketch - that's probably the most recent one where Harry Potter and his friends are at Hogwarts and begin to realize that the stuff they are learning allow for very little room for errors - especially after Ron adds only one extra drop to his potion and it causes his head to explode rather than just change the color of his eyes and Neville is attacked by his own hand that turns into a monkey head when he was mispronounces a spell to make an orchid appear. Harry and Hermione end up transferring to a public school in the US thinking it's got to be safer than Hogwarts but Hermione ends up getting cyber-bullied so badly she hangs herself. When the kids in the school hear that, they dance while Harry looks on stunned. Direct swing at how embarassingly crappy and out-of-touch our public schools are and especially the kids where it's become almost acceptable for bullying to result in students killing themselves. I immediately thought of that one girl [Prince] who had just moved to the states and was literally bullied to death a few years back. It's kind of sad that public schools are more dangerous than a school where people would learn to blast holes in walls just by pointing a stick.
Strawberry Shortcake and the Aspergers comment - oh yeah, this one.
This was the sketch where Strawberry Shortcake is explaining to Baby Needs-a-Name how important it is to get a good and proper name because a name helps make you who you are. And then Bitch Pudding barges in with her usual attitude, goes to the fridge for a drink, wanders out, and then bursts back in yelling to Baby "Your name is COCKFACE! Blam!" Facepalm moment.
Strawberry Shortcake tries to explain away Bitch Pudding's problem by including a 'maybe she has Aspergers or something' and that they'll find Baby a real name but it's too late. Baby replies that her name is now Cockface. Bitch Pudding strikes again. I didn't even see that as a swipe at Aspergers, I saw it as a toss-away comment. They probably could have substituted time of the month for Aspergers and it wouldn't have changed the tone a bit. I'm thinking Aspergers was used because it's been in the news a lot as more and more people become informed about it and Bitch Pudding has always been portrayed as someone who doesn't read social cues for what is acceptable in certain situations and can be quite blunt in her statements [both of which are things that tend to fall in varying degrees within the Aspergers category].
There's probably a whole lot of things I could pick apart and analysis in the RC universe if I really got going. 