I don't often post but this one was hard to resist. First off, those of you who keep saying 1990s, 1980s, and early 2000s cartoons are better. Remember that nostalgia is like having a mouth full of cocaine coated marbles; it makes you feel good, and say stupid things. I had a lot of nostalgia for Dragon Ball Z but watching it now it's just stupid, drawn out, and boring. I think too many people are letting nostalgia poison them. Seriously go back and watch some of them. I have in the past. I loved Rocco's Modern Life, Invader Zim and Angry Beavers to name a couple. Now seem like crap to me now. Although some, like Rugrats(the original only), Transformers G1/G2, and Doug are timeless to me. Yes it's subjective, but you can't say everything new sucks because your nostalgia gets in the way. Seems like a lot of people watch 5 minutes of a new show, and then deem it crap, because they remember their childhood shows as better then they actually were.
Second, I don't understand the Ben 10/Alien Force/Ultimate Alien hate. ButI can identify with Ben, having had permissive parents,(Though mine never insisted I use their first names. Being transgendered(though not to the point of wanting a sex change), the freedom they gave meant a lot.) and a doting grandfather. Sure he comes off as a bit of a over confident jerk. Then again who wouldn't? Being a normal, if slightly nerdy kid/teen. Then boom getting super powers. That would make anyone into a bit of a jerk. That's like saying SpiderMan sucks because he's a mopey nerdy dork, who sometimes gets overconfident, and is sometimes a jerk. Heck that's what made him identifiable with his target audience. Both characters use their flaws to grow, and the whole complaint smacks of someone who watched a few episodes of something that's better as a series. Which in my opinion invalidates the Ben 10 vs later series(Alien Force and Ultimate Alien) complaint, because you have to see all of each previous series for the next one to make sense. I will say the tie in movies, and the live action alternate time line movie were pure crap imho.
On topic: Pretty much most of the current generation of cartoons are passable, and they'll be the nostalgia fodder for the next up coming generation. I have to say most of the newer toddler/preschool shows are mindless dribble, especially Dora. But they always are, Dora gets my goat for forcing political correctness on children too young to understand it.
My personal shit list of adult and teen-adult cartoons: Problem Solverz, Gumball, Johnny Test, Fan Boy and Chum Chum, Sidekicks, Ugly Americans(objectively not too bad but I personally hate it), Planet Sheen, Family Guy, The Cleveland Show, American Dad, Drawn Together, Squidbillies, Bakugan, Beyblade(those two are 22 minute long commercials, worse then Pokemon and Yu-Gi-Oh! ever were), Aqua Teen Hunger Force, Aqua Unit Patrol Squad 1, The Loony Toons Show and Spongebob Squarepants(I like the older stuff, but now it's mostly crap, but sometimes has a good episode.)
I excluded the few I can't remember the name of.
My list ones I like and watch: Ben 10/Alien Force/Ultimate Alien, Adventure Time(disturbing but fun), MPL: FiM(not a bronie! it appeals to my girly side, being MtF TG), King of The Hill, Bleach, Phineas and Ferb(always the same, with different Mcguffins, but still fun), South Park(say what you will, but it makes any stereotype look ridiculous, and that's why it's funny), Fairly Odd Parents, Danny Phantom(haven't seen it recently though), T.U.F.F. Puppy, Classic Loony Toons(airs at 6am and Noon on CN), Tom and Jerry(airs after Classic Loony Toons), Symbiotic Titan(did this get canceled?), Young Justice, Clone Wars(though I consider it non-canon, I still like it), and the new Thundercats.
I couldn't list Regular Show or Generator Rex, since I neither hate or like them. It's entertaining if absolutely nothing else is on, but usually I can jump to the History Channel, Discovery, Animal Planet, TCM, or AMC in that case and find something better to watch.
Edit: Didn't mean to offend anyone who has a lot of nostalgia or just genuinely likes old cartoons. Just saying don't count out the new if/because you remember older cartoons as better then they might be. Also just stating my opinion, don't want a flame war my self.
Edit two: Whoops misstated the last edit.