[Shacklz]

I use Duolingo to learn French, for a few years already. It definitely can bring you up to A1/A2-levels of proficiency (at least for French), which is definitely a solid starting point to engage with the language further. In my case, I've started to take weekly evening-courses. If I started another language, I probably would start again with Duolingo for the super basic stuff, then start to learn vocabulary with Anki, and then start with some paid, organized course that guides me through the more complex parts.

I still use Duolingo almost daily to have some continuous language exposure, for which I still find it useful (especially as the gamification helps with staying engaged). It has its limitations but it does help me. Just to give a bit of a counterpoint; I find your statement a bit overly broad.