Adding to this:Glennderp said:I got a few.
Rick and Morty - Fantastic theme to it. Really well written and the character designs are simplistic but great.
Gravity Falls - I actually started watching the series a month ago. One of the few cartoons with an actual plot/story. Fantastic story line and brilliant writing. Characters are really well developed. Not to mention the backgrounds on the show are a work of art.
South Park - Hilarious and REALLY well written. I love the messages they try to teach in a satirical way and how the creators just don't give a ****.