I came across this box set and it's really messing me up for a lot of reasons (it is marked TOS despite having characters from all over the place, and for some mistaken reason Gul Dukat is included) but what I really wanted to talk about was Q's inclusion.
Do people usually consider him a villain?
I suppose he has done a lot of things that would be considered antagonistic, with a big one getting a number of Enterprise crew members killed in the first encounter with the Borg, but that seems, at least from his point of view a tough love moment. In the long term, Q did seem to have the survival of humanity as a goal. His judgment of humans was pompous but not villainous.
Using the term antagonist is the foremost point of order. Did he introduce the Federation to one of its most formidable foes? Yes. Did that interaction result in the deaths of 18 crewmembers? Yes. But for the sake of making aware and preparing Starfleet for the hardships to come, it appears to have been of use. Not about to excuse the means to an end argument, though. Q has insider knowledge of potential outcomes and is known to be a meddlesome force (Quint not withstanding). Do his actions then and later justify his intervention?