"Describing the nature of someone's marriage is not really a true or false proposition," Fish said.
The lawsuit doesn't matter from a PR perspective, according to Hollywood publicist Howard Bragman, vice chairman of Reputation.com.
"This got lost in the avalanche of other negative stories, in my mind," Bragman said. "That's not to say it wasn't meaningful to him, that it didn't hit him in a heinous way."
Cruise has successfully sued tabloids before, though not about stories involving his children. "He could be trying to make a point to deter other tabloids from doing the same thing," Fish said.
Or his motivation could be even more basic.
"You can say a lot of things about Tom Cruise, but not his kids," he said. "I think everyone knows that."