I'd say on paper, the idea of a reboot for Superman and Wonder Woman was definitely a sound one at the time. They'd been bogged down by so much contradictory continuity that accumulated since the first Crisis, and WW in particular could benefit from losing stuff like Amazons Attack and all the crap with Donna. But the main issue for both was the lack of planning, and for WW ideas that clashed with the core ideas that went into the characters (power from a man, villainous Amazons). Superman at least got the Morrison Action run which is still the best run he's had in recent memory so the exercise was worth it just for that, but still the overall planning was bad and it fizzled out quickly. But it actually still embraced the core of the character in ways Azz's WW didn't. So I'm the opposite with Rebirth: Rebirth Superman bores me senseless, but I love Rucka's groundwork for WW. It was a more streamlined version of post-Crisis and Bronze Age stuff that leaves her a better foundation than she's had in a while.
In my ideal world, we would have gotten Morrison's Superman and Rucka's Wonder Woman in a better planned New 52, both lasting longer than they did and both being better planned out with coordination between titles and follow ups. Now both are in just as bad of shape as they've always been