Well, I'm going to say rounded. Although there are good and sympathetic people on the Iran side, the regime is cast as evil. The Israelis not cast a good, but as lethal, pushing their interests in Iran by whatever force is necessary. It's unlikely you'd be rooting for the Iranians, but I would not describe the Israelis as wholesome.
One of the prominent Iranian characters is a patriotic police supervisor who is looking for the "Israeli terrorists" (Mossad) (for perspective one person's terrorist in another person's freedom fighter) and the Mossad makes choices that are not how I would describe as moral. They kill anyone who gets in their way. Their goal at the beginning of S1 is through espionage, to assist in facilitating the destruction of a nuclear reactor. "We can't tolerate a nuclear Iran."
Something signifiant happens during the second half of Season 2 that I won't mention other than to say it changes the character dynamics of at least 2 prominent characters.