i think the gold generation of cull accomplishes what it was meant to, but its combat stats are lacking: doran's blade is just better for trading AND sustaining in lane, to the point where the reason most people other than
buy cull (to gain some gold halfway through a matchup they expect to have trouble with) gets magnified as they lose the matchup even worse than they would have if they'd just gone doran's.
what they'll probably do (they've mentioned buffing cull) is add 2 ad to the item so that it trades slightly better with doran's blade, while still giving doran's the overall, punch-for-punch edge