Devourer

Does anybody find devourer to be fair? Devourer is useable on so many champs. It is so easy for a champ to get devourer and then BotRK and be able to deal massive damage. Adding ravenous hydra just makes the lifesteal insane. Diana does lots of sustain damage with just devourer and nashors, alongside lich bane, now she has massive burst and sustain. I have even seen an ap gnar with devourer carry a game. The time it takes to get sated is not long enough. I've seen devourer sated at 16 minutes. I just see no way to fix this without just reverting devourer back to it's former, sub-par, self. Maybe I'm just not creative enough for a different solution.