Gravity Falls isn't too bad! Nothing special for me, but the animation in the opening as well as the song are pretty nice. I also like the new TMNT, the character animation is snappy and cute. And Phineas and Ferb, while repetitive, is a decent show. None of those are Cartoon Network though, which I find pretty unwatchable now (Adventure Time is tolerable, not painfully bad as most of the rest of the lineup is for me).
I will admit, I prefer the shows I grew up on in the 90s. I was watching a few old episodes of Mighty Max and the writing was really witty and fun for a show that's based on friggin' Polly Pockets designed for boys. There was some great writing in the Batman shows of the time as well, and Disney knew how to make a continuous storyline with characters that had depth. Warner Brothers 'toons were very smart and appealed to both the kids and their parents. I find many current cartoons to be lacking in good plot, suspense, character development, and writing. It feels like a lot of "so random LOL!!! I made a funny meme reference!" humor is shoe-horned into them. But there are a few good ones in any generation, and there are some bad ones no matter what decade you're looking at too. Some years are slower as well, need to give it time to come back around and hope that some new unique material gets out there.
I would normally have said that the cartoons today are rubbish compared to the ones I grew up with but that's because I didn't grow up with them! Your tastes change as you get older so that's a factor and I think part of it is also about nostalgia. I'm sure if we could all see another episode or series of our favourite cartoon that no longer airs we would all be very happy but that's because it reminds us of our childhood and care free days
Personally for me, some of the 90s cartoons will be my faves! Powerpuff Girls, Dexter's Laboratory, Ed, Edd and Eddy etc. Then there are some which I love but have changed through the years. TMNT being my favourite!! I remember watching the first show when I was quite young and then growing up on the 2003 series and now I've fallen in love with 2012's new show Good times
personally I hate the way classic 2D cartoons such as winnie the pooh and garfield are now being remade as computer animationns the end result isa poor imitation o the original xompletely lacking any soul