I think many of those that say Voyager weaken the Borg aren't IMO considering replay value nor the quality of HD.
The Borg eps. viewed as stand alone eps. IMO are suspenseful and often full of drama & action, add the HD quality to it and just hearing the Borg is a thrill all over again. Voyager was always a show geared to bringing back the casual viewers TNG once had.
I think the producers and writers of the series always had this idea in mind of rewatching the series as mostly stand alone eps., which IMO still keeps the awesomeness and fear factor of the Borg intact.