LingQ at present only seems to go up to advanced 3, I've been campaigning for some higher advanced levels.
I think like Skyblueteapot that LingQ grades to early learners as Advanced 1 or Advanced 2.
Here you can read about it: http://www.lingq.com/help/avatar/
For example I would consider my level of English as B2. But LingQ grade me as Advanced 1, and I'm not far from Advanced 2 on LingQ.
Personally I find speaking to our tutors here, and then reviewing the conversation report very useful once I have enough of a base.
In a way our levels indicate the user's potential. It is up the the learner to turn that potential into reality.