I think our team is much better after the trade, actually. I've been in the minority here for some time, but I think Hill is lucky to have an NHL job at all -- his angles are consistently off and he is very bad at reading the play (two things that he should have already learned prior to AHL level). So far he's gotten away with it because he's big (i.e., takes up more net) and also because teams haven't scouted him. Once teams start scouting him, his honeymoon is over, personally I think he will have a Louis Domingue-type trajectory regardless of whatever contract San Jose decides to give him.
Either way, a 2nd round pick is a great return for a goalie, especially an unproven one in an expansion draft year. Armstrong did really well here, that's not even counting the $2m or so of saved cap space that no one is talking about (Hill is an RFA this year). Great trade in my opinion, can't really ask for more