I found through the last two decades that I started to enjoy animation more than the comics!!! 
I love, worship, adore, and would highly recommend any of the following series:

Justice League/Justice League Unlimited
Batman Beyond
Teen Titans 
Brave and the Bold

I love these the most because for me they all are top-notch in every aspect.  When I first watched them I felt like I was 8 years old and discovering comics for the first time, and isn't that hit of nostalgia and discovery (at least for an oldtimer) one of the most powerful feelings ever?