Yeah when devourer first came out I thought it was great, I played a lot of Aatrox jungle with it for example, once sated Aatrox is ridiculous (or more so he's viable again.... which should be something for Riot to take note of....). However there were those games where I'd be doing scuttle and my nearby lane would be ganked, so I'd either have to run to that lane and help out, sometimes even resulting in my own death as well or more often just resulted in no kills on either side and me just saving my laners, but also sacrificing the scuttle usually, OR I'd try to finish the scuttle and get those stacks so I could be truly helpful with sated sooner but also risk my bot lane dying then the inevitable shit storm that would be thrown my way for not also dying with them.
In both cases I felt like I was losing something, the only times playing a devourer jungler even felt good was when my lanes were winning hard enough to withstand an average gank on their own so I could just farm then come out of the jungle sated and useful, which is like 5% of games if that.
So yeah, I just don't play devourer junglers anymore, my teams usually need me to carry more then just one lane single handedly for them in order to win and as a devourer jungler that's just not optimal. Back to the cinderhulk I went!