Fully developed Flask projects tend to be significantly more hairballish and custom compared to something like Django, but it's extremely hard to kick the habit and convenience once something has initially been prototyped in Flask (or Bottle, same deal). Commercially I'd much rather encounter an existing Django project, but at home 90% of the time I'll reach for Flask first, the rest being cases where there are some off-the-shelf Django components that will definitely save a ton of time, and the ceremony is worth paying.