TLDR: To-Do is not good enough to even consider.
Although it felt fresh and i have tried it, I do not use it.
Wunderlist is light years ahead.
To-Do only offers a tiny fraction of Wunderlist functionality and instead of a replacement, it is more like an impostor. :winktongue: It even apes the Berlin skyline background as if someone just wanted to antagonize Wunderlist's legacy and European pedigree.
It's great for shopping and soccer moms but there is not much more use in a real world digital production scenario.
On top of that, it seems like something someone made with no future feature plan at all. Like a garage project. It doesn't fit anywhere in the O365 family either.
Its the same team that made Wunderlist. Plus, as I stated, if you join the Google+ page, they may not make it 100% clear what it is, but its clear they have objectives and roadmaps, as when people ask for certain features, they're told where it is on their list, either something they hadn't thought of, something they considered and decided against, something that is still under consideration for future implementation, or something that's currently being worked on.
It's fit into O365 is more integrated than Wunderlist, at least in the background. ToDo is literally tied to your Outlook Tasks list. You could create a task in outlook and it'll appear in ToDo. ToDo is really just a client for O365 Tasks at this point. They're working on it, but its come a looooooong way from Project Cheshire. It was great seeing them add things with each new beta. I had gotten a little overexcited when the Cortana logo appeared in the top right instead of the lightbulb, but last I checked, thats as far as Cortana's gotten so far.
It has a better foundation for integration than Wunderlist did. Wunderlist was a separate project that was being wedged into Office. ToDo is literally being built out of and on top of Office. In essence, its not just integrated, its actually a *part* of Office.
No one is arguing that it's not on par with Wunderlist. I don't think anyone has ever tried to make that argument. The development is still very early on and the developers are very responsive and active. I couldn't disagree with you more on the development approach.