IMHO, a party that owns or invents a patent that it does not use and never intends to use in any real products and they only litigate with said patent makes it a true patent troll.
(I'd also posit that this is a good thing for consumers because it is a force pushing back against vertical integration. In the long run, I think it'll turn out to be a bad thing for consumers that the market is moving from ARM supplying IP to dozens of manufacturers, to a handful of companies with like Apple and Samsung moving CPU design in-house within a vertically-integrated supply chain.)
I actually somewhat agree with Timothycquinn. Companies that make all of their money from suing people are, at the very least, suspicious.