Definitely a black mark against democracy as a whole
Well, ironically, it was arguably our dedication to democracy that caused the problem in the first place. Obama evidently did not want to adversely effect an election by revealing too much too soon, but also did not know the extent of what was going on or its impact. That wasn't known for months after and still the full extent has not been measured, due primarily to sites like Facebook and Instagram and Twitter, etc., not providing the full extent of what happened and how many responses each post received and the like.
What we do know
so far, however, is that it was a far more massive attack than anyone knew at the time. Literally unprecedented. An electronic coup by a foreign nation that had been planning it for several years, evidently. Even further back with Trump--to at least the 80s--in regard to grooming and laying the groundwork for an asset to one day be "activated" in this manner.
So, I'm not exactly sure how it's a black mark against democracy any more than an invasion of another country would signal that the invading country's method of ideology somehow failed to stop an invading force.
There seems to be an internet/technology-fueled, binary thinking/ADHD that has set in, where people think that some wrong must instantly be corrected or else all systems have failed. This is a massive and unprecedented cluster fuck, with brazen criminals acting on scales never before seen in our entire history. We literally have a foreign asset in the highest, most powerful position in our country--if not the world--and worse an entire substructure of entrenched power who know this and evidently don't care, because they are either equally corrupted or just generally corrupt and don't give a shit and are using him as their own useful idiot.
But exactly what can "democracy" do to change any of that? We had an election that was hijacked--and still in danger of being hijacked again (in fact, it's an absolute guarantee)--so again, what exactly can we do, because the next step (after another hijacked election and Dems in Congress fail to correct for) would be to take to the streets and exercise the 2nd Amendment.
Not sure if civil war constitutes a test of "democracy" or not, but if this can't be resolved peacefully and through the rule of law/due process that we already have in place, then armed militias are the only other option.