or maybe you're just blind to this story finally jumping the shark.
It's bad writing if Jon dies because of all the time and false importance placed on him, and it's bad writing if he's resurrected, because they've already done that to a couple minor characters and it would make death overall seem like less of a threat than it should be.
I don't see any smart or interesting way out of the hole the writers have dug themselves into. I'm out.
How is it bad writing?
They've showed ONE minor character be resurrected. It would be bad writing if Jon was resurrected by the Lord of Light WITHOUT any prior precedence being shown in the story. If there has never been any indication that people come back from the dead, it would be cheap to resurrect Jon, because suddenly it would feel like the show is making up rules to bring him back. But Beric being resurrected is a big hint as to, "hey, this can actually happen in extreme circumstances for as of yet unknown purposes."
So we do have that precedence, set up a long time ago by a minor character with very little (seeming) relevance to the show at the time. It's called foreshadowing, and that's generally a sign of good writing. ESPECIALLY because this is a series where death is often sudden, unpredictable, and final. It would make a resurrection even more interesting, because this isn't a show where people just magically come back, so such an event would be hugely important to the story.
I know this isn't a book reader thread, but if I can stray a little bit from the show, there is a massive amount of story details and plot points that point to Jon's importance in the story (and this is true in the show as well, albeit to maybe a lesser extent). Whether any of this comes to fruition, or is a huge bait and switch in preparation to the real outcome, remains to be seen. The story is far from over. It's ridiculous that people are jumping ship without bothering to see how this issue is resolved before declaring it "BAD WRITING".
EDIT: Beric is the only person who has been resurrected. The Mountain is basically frankensteined and can hardly even be called Gregor Clegane anymore, he's some kind of abomination of Qyburn's. Using Jaqen H'ghar as another example is also extremely erroneous considering that he is part of a group called "the Faceless Men" who can assume other identities, and "Jaqen H'ghar" is doubtful to even be a real person. Wights.... that's not even a valid discussion point. Zombies =/= resurrection, in this case.
There is still only ONE case where a person has completely died, then been brought back to life exactly as the person they were before.