The few races I watched were just silly. The tracks were so narrow and had too many 90 degree turns, it was just painful to watch. No flow. Nothing interesting happening.
That's a problem of electric technology not being good enough to have a Formula E race at Spa or Monza that lasts more than a few laps. But I think that's the goal of the series, and they're slowly moving closer and closer to that goal.
I'm not watching yet, but I'm optimistic about its future.