None of the top apps look like this, because this is a new app, and the theme has just been released.
But you didn't rant against THIS specific theme and how it looks. You ranted against theming iOS, period. You said it's a disservice to the users, users don't like it, etc.
So, answer me and the parent this: is that's so, why tons of top selling and downloaded apps, the most popular ones by users and critics, are heavily themed? Letterpress, Clear, Paper, Google Maps, Evernote, iA Writer, Vine, Flipboard, etc etc.