Don’t use it for your game format 
I don’t hate it as much as some because it has a place and time but as a final game format to ingest, no.
Anyone that hasn’t voted yet could go add their voice for a fully opensourced FBX that I suggested.
And only then would it might be ok as a format to export to /ingest from but there are lots of things to consider as you will want to have management of the data outside of MotionBuilder or any existing tool that requires .FBX software support.
In short- no, don’t! If for some reason you still say, but it won’t happen to me go read my FBX post
and the link to the previous one that covers some of the last year of FBX nightmare
Brad