Objections to Reports and Recommendations are something like an appeal. The District Judge is tasked with addressing the alleged errors of the Magistrate Judge de novo only to the extent they are "properly objected to." Fed. R. Civ. P. 72(b)(3). Thus, it is the job of the parties to raise objections to an R&R in a procedurally proper way. If they fail to do so, the District Judge is hamstrung to an extent. This outcome was on display in a recent ruling by Judge Andrews, in which both sides failed to properly object to a portion of the Magistrate Judge's R&R, leaving a patent with "serious" validity problems alive (for now).