Okay, so now I've watched every episode out as of me posting this, and I have to say, it exceeded my expectations. Ezra is a surprisingly likeable protagonist. The Inquisitor is an awesome character in design, voice, and personality. Agent Kallus is pretty cool too. I desperately want to like Kanan, but he is just so flat that I can't, not yet. At this point, he's my least favorite of the main cast. The Stormtroopers seem a bit too weak as well, and I can't get over that ridiculous energy-slingshot, which only exists because Disney doesn't want to give a 14-year-old a gun.
Overall, this series does not live up to Clone Wars, at least not so far. However, it is much better than I expected, and is thoroughly enjoyable to watch. It motivated me enough to buy both Rebels sets so far, which are pretty nice.