rebels isnt a bad show, i liked it better than clone wars, but i have no love for clone wars. heh. some may remember a particular rant i had some years back about that particular subject.
anyways to answer your question, yeah its worth watching.
it started off pretty strong, but tapered down to almost a kids feel type show near the middle, hondo came back which was pretty good, and then some cameos of movie characters and even them making Grand Admiral Thrawn canon was exciting. the season finale was ok, but maybe a bit of a let down for me personally.
my main complaint was that i was hoping rebels would be more soldier and story arc biased, rather than jedi and force biased since jedi were all but extinct, and it became a jedi story pretty quick. i was hoping for a more rebel alliance centered story, focusing on the actual growth and spreading of the rebellion rather than just a small group of 6 individuals.
the rebellion period is my favorite period, it was the one i grew up with, so thats why i enjoy movies like the original trilogy and rogue one and solo.
and that darth maul fight with obiwan? they dont need to redo that on the big screen, if they do, im afraid they'll change it for awesomes sake. and that was a great scene.