Is Duolingo A Waste Of Time?
It's a waste of time. In fact, it's just as bad as the education system Von Ahn criticizes. Duolingo outsources its translation services, allowing for awkward sentences to slip in undetected. And translation (the core of its platform) is already widely known to be an ineffective way to learn a language.
Duolingo can aid in your journey to become fluent, but if you aren't actively practicing the language with a native speaker or practicing your comprehension skills by listening to native conversations, then you will not become fluent.
Can Duolingo Make You Fluent? - Happily Ever Travels
Other flaws of Duolingo You can log in and start learning Finnish, Welsh, or even Klingon. The problem is that they diversified themselves too much. Some courses offer a lot more than others. For instance, West European languages offer access to short stories with short questions after reading them.
Duolingo is the Most Dangerous App for Untrained Language Learners ...