The network view is useful, however the relative sizing of the nodes limits its use in terms of the insight that can be gained from it. As an example, I've got a network view with node sizing set to the sum of a field - the values vary considerably from node to node (from 1 to several thousand), however the size of the different nodes is not noticeably different. This could potentially be fixed by including functionality to adjust the level of variation in the size of the nodes via a slider as with the map view? Would it be possible to get this included as part of a future release?
Unfortunately this has not yet been implemented due to other features taking priority. Please vote on this feature (the vote button is at the top of this forum posting) to increase the chance that we develop this functionality in an upcoming release.