Let's take a trip down memory lane.
Wikileaks published the diplomatic leaks in three large chunks, which included the "collateral murder" video.
At the time, Julian was surprised at how little impact the releases caused. He thought at the time that a huge drop would cause a huge response, but that turned out not to be the case(*). The news cycle quickly moved on to other issues.
He realized then that to get maximum effect you have to play the media a little.
So now he announces ahead of time that he has the data, then releases the data. He releases the data in smaller chunks, to spread the effect out, to keep the news cycle interested..
People see the "I have an interesting drop coming up" announcements as feeding his ego, but what he's *really* doing is getting everyone's attention.
And of course, a single monolithic drop is easy to counter with a juicy counter article. We saw that with the Trump "locker room" clip, which completely eclipsed the first of the recent Podesta E-mail drops. If Julian had released the entire tranch at that time, it would have been lost in the noise.
If Wikileaks had simply released everything at once after getting it, and not let Assange make his statements obviously made to be clear attacks on Clinton's campaign, you might have a point. But they didn't.
You're completely wrong on this point. Portioning out the drops gives the data maximum exposure, and helps to ensure that people notice and comment.
Julian is doing a good job, let's not lose sight of the sheer volume of corruption he's brought to light.
(*) From my memory of an interview he gave.