Haven't gotten to season 2 yet, but am midway through season 1 and so far have really enjoyed it. They put more thought into the Jedi mythology than the prequels and the way the cast is set up - it's basically Firefly - is fun. It's nice to like a Star Wars property again. That's a thing I haven't said for a long time... a long time...
Some possible tie-ins between Rebels and The Force Awakens. http://www.ew.com/article/2016/01/15/star-wars-rebels-video-lightsaber
Star Wars Clone Wars and Rebels have been so good. I think it kind of hurt my movie watching experience with Force Awakens.