The Hartnell era, though good in its own ways, is very slow. For whatever reason I think of all the Hartnell episodes, The War Machines (and possibly The Tenth Planet) have the best pacing.
What do you mean "missing from that Hulu list"? Do you mean it's not in the list? That would mean that the episode is in fact available on Hulu. Or do you mean it's missing because it's in the hulu list?