I mean, that'd be a fair point if Nemesis and Before Dishonor weren't both kind of terrible.
So you're OK with bringing back dead characters as long as the story they were killed in doesn't meet a certain standard? Death doesn't work that way.
Bringing back Spock should have been a one off. However, Genesis gave them an out. As Carol Marcus said "life from lifelessness". It was a totally impossible way doing it from a scientific point of view but Trek isn't and never has been a hard science series. For all of Roddenberry's claims that the science should be correct it's played fast and loose with scientific reality from the very first episode. In that context, the resurrection of Spock worked for the story.
Now we've got millions and billions of deaths with the Dominion War, Destiny and others. We still get characters coming back from the dead but just the "hero" characters. Kirk, Janeway, Data. Either death is reversible as long as you're a highly regarded Starfleet officer or there's been a lot more people coming back from the dead than we've seen. Either way, death is no longer The End. It's down to a case of deciding who's worthy. Are the 60 billion dead from Destiny less worthy than Janeway? Or Kirk? Or Data?
Star Trek may not be hard science but it shouldn't be a super-hero comic series either.