Polestagger is necessary to maintain equalibrium with the melee classes. However, I think it is too easy to abuse with higher wpf. This could be changed perhaps, with the higher weapon speed and/or wpf,the less polestun it has.
If you think I'm a retard, that's ok, and I agree wholeheartedly. But, put a warspear in the hands of, say, a 15:24 build, the opponent will rarely be able to return an attack. Poleaxe is similar, but with an 18:21 build.