Did they do "the same damn thing", though? What kind of similar episodes from TOS, TNG, and DS9 are being compared with VOY episodes that do "the same damn thing?"
Kirk fights off Gods, stops superbeings like V'Ger or the Whale Probe or "God" from "The Final Frontier" and no one complains.
Voyager stops the Krenim Timeship, which could've threatened the fabric of time and space, and everyone complains about how they shouldn't have been able to do it.
TNG stops the Borg Cube from conquering Earth, no one complains.
VOY destroys a freaking PROBE SHIP in "Dark Frontier" and gets nothing but complains over how they shouldn't have been able to do that.
DS9 does a big epic story about a Galactic War, and no one complains about Sisko's role being too important.
Voyager runs into the Borg/8472 war and gets nothing but complaints over how an alien species that can fight the Borg shouldn't exist, and that VOY shouldn't have played any major role in this war.
I don't think VOY gets any harsher criticism than any other Trek. It has its vocal opponents and just-as-vocal proponents. Don't develop a persecution complex over it.
Hardly anyone stands up for VOY or points out the unfair double standards, though.
Hell, other shows like Farscape did similar things (Crichton being able to stop a massive galactic war between the Peacekeepers and Scarrans and brings both empire to their knees) and no one complains there either.