Unfortunately, it has been a long wait for everyone lately. ACS is taking 6 weeks minimum to complete assessments in the last 2 months. Until July, this only took 2 - 3 weeks wait time.
I wouldn't think that you would get a negative assessment. In all probability, the Assessors are sitting on a big pile of Assessment requests as their systems had some issues in July - August 2017.
I would suggest you to await their response. May be, mail them once every 5 days asking for update if you dont get a response.