I'd rank plenty of Voyager episodes up there among Trek's best. Off the top of my head I'd say Timeless, Year of Hell, Before and After, Counterpoint, Critical Care, Real Life, Latent Image.
Are they as good as In The Pale Moonlight? No, but then again, neither is anything from TOS. TBH there are only a handful of TOS I can even take seriously as science fiction at all, let alone legitimately consider ranking among Trek's best (although City on the Edge of Forever is definitely one of the greats that I watch regularly), so the thought of Voyager episodes not comparing to that is laughable.
I'm not saying Voyager was the best series by any means, but when it hit the mark (which was still pretty often), it was definitely up there with Trek's best output. The show had clear flaws, but they learned how to play to their strengths, and minimize some of the weaknesses, and even managed certain types of episodes better than any other Trek series.