I think a lot of people across the entire broad range of opinions had... latched onto the Mueller report as something it wasn't, wasn't intended to be, and never could have been.
I've half jokingly mentioned in the past that the way "Point Scoring" works in modern American political discourse that everyone is waiting for some moment where "the jury" is going to stop deliberating and pass some final judgement on politics, declaring one of the two vague "sides" the "winner."
Clinton's Impeachment, the Mueller Report, dozens of other examples... the reason these never felt like anything was really accomplished when they were all said and done is because people were treating them as if the very political spectrum was what was on trail in those cases.
I actually wish I could go back in time and experience, unfiltered and in the moment with no hindsight, what the "feel" was during Watergate. I wouldn't be surprised if the agreed, unspoken but understood, feeling under the surface during Watergate was that it was the entire "Republican/Right/Conservative/Etc" mindset that was on trail and that a win that would finally give the "Democrats/Left/Liberal/Etc" mindset the keys to the kingdom. I do wonder if something very deep and basic "broke" in American street level politics when that didn't happen.