Basically 3 things..... Distributors Shares+Nett Collections+Makers earnings.
If distributors lose money but the makers earn huge and also nett collections are good to very good then below avg to semi hit verdict given based on distributors loss. Eg - Jai Ho, Dilwale, Tubelight etc.
If distributors earn profit and the makers also make money but nett collection is something you can't call it good then clean hit verdict is not generally given. Eg - Bareilly ki barfi, Shubh mangal Saavdhan etc.
If distributors are in profit, nett collections are good to very good and makers also make money then Hit to Superhit Verdicts given. Eg - JLLB2, BKD, Toilet, Judwa2 etc.
If all the three things (D share+Nett+Makers earnings) are huge then Blockbuster and ATBB Verdicts are given, depending how huge they are! Dabang, ETT, CE, BB, Pk, Sultan, Dangal etc examples.