Here it is:
How about having a "buffer" gallery with no comments nor sharing options. and only registered members of imgur get to see it.
Only up/downvotes and reporting possible. If a picture doesn't meet a requirement of N upvotes or is reported, it will never be commented on and disappear from gallery. That would help take care of spam and "bad quality" uploads.
Just my two cents, that's it.
Customer support service by UserEcho