No, but it does worsen the trilogy. If the trilogy is predicated on certain ideas and mechanics, and those are betrayed in the last segment, then the series itself becomes worthless.
If you want to enjoy Star Wars as just a singular self contained story, then that one film won't be tarnished, unless you don't like edited re-releases, which is another argument entirely. But if you like Star Wars as a series, then the direction of the series matters.