In account settings, I’ve specified my native language being Russian, but I did not really expect UI to be in Russian, especially with such a literary translation. I’d rather switch the whole UI into my target language to force myself to learn and use it. This is what I always do with my Mac OS X, and would suggest everyone to try. It may be very dramatic with non-Indo-European languages though. Even though approach LingQ takes is fine for vast majority of people out there, I still wanted to share this.
Another thing that really bugs me is minus sign or hyphen being used where dash or even em dash should be used. This is a shame for web sites in general, but this is three times the shame for a language enthusiasts community with paid content & services. I mean, would you like your kid to learn a language with a teacher who does not care about punctuation at all? One doesn’t have to be genius to make that improvement.