Hamas are Islamist arseholes, and their attacks on civilians are inexcusable.
But Hamas are absolutely nothing like ISIS.
To claim otherwise is just to out yourself as "person who has absolutely zero understanding of geopolitics, ME politics, political Islam, or any other potentially pertinent topic".
ISIS was (is, for the small remnants that still remain) a globalist, Salafi Islamist movement with the eventual goal of conquering the world and subjecting it to its particular, pretty twisted, understanding of Islam.
Hamas is, in essence, a nattionalist movement with an islamist twist. Its ultimate stated goal is to re-conquer all of historical Palestine, and their ideology is, in essence, Islamist.
I may seem "blasé" about this - and maybe I am! I just happen to come from the angle of "well, I already thought Hamas sucked 20 years ago".
But, no, ISIS, as a globalist movement, and Hamas, a nationalist one, are nothing like each other. I am an atheist and just not a fan of any sort of islamism (have I mentioned that I am an atheist). But it serves noone to pretend that "Islamism" is not as broad a spectrum as, e.g. "liberalism" is.
For us Brits: it´s a bit like - deliberately exaggerating in order to illustrate my point - claiming that "UKIP are like the SNP - both state they believe that Britain should be an electoral democracy".