I don't think there is a magic set of 'topics' that will bring in more traffic than others.
I have created Hubs on Private Parking Companies, Tools I have bought from Aldi, an appraisee of Maggie Thatcher & making money from scrap to name but a few.
My highest-scoring Hub is my PPC one with close-on 29,000 hits to date. Private Parking Companies and their pursuit of innocent motorists are a hot topic here in the UK, so I am not surprised to have received so many hits.
I am surprised however that in excess of 7,800 people have read my review of Aldi's cordless multi-tool as it is not something everyone has a use for.
It does help to keep your hubs up to date if hubbing about a given subject.
I created a guide for speeding up slow PCs, but despite this being a money-saver, I have had little or no views at all. This is down to the number of alternative sites offering the same or similar information.
I also do not subscribe to the idea of 'bad traffic'. Any traffic is good traffic even if the visitor only reads the first couple of paragraphs before moving-on. I have looked at many hubs and decided that some are not of interest to me (but then again, they may be of immense interest to you).