I don't think it's fair to say the writers gave up on this season and put no effort towards it. I'm sure they somehow think they're making compelling television this season. It's just that not everyone agrees, ESPECIALLY not people on the Hype. However, I have seen other people on the Internet (and spoken with some friends in real life) who don't hate it and are still invested. For instance, Entertainment Weekly posts recaps of episodes and in their comments sections, you can see that plenty of people are still digging it, discussing it, and unsure of what happens next.
In terms of this Dexter thread, though, we've seen a total shift that might be revolutionary for the Hype (or at least the Misc TV Series section). Originally, we were all like a bunch of little Dexter nerds, happily engaging in intellectual conversation about the show, gushing over its merits, eagerly anticipating its return, and being critical when we needed to be (*cough* Doomsday Killers *cough*). But now, it's like everyone has morphed into a bunch of jocks who openly mock Dexter. The whole thread is filled with jab after jab. Most of the die-hard fans here have "cheated" on the show by giving in to spoilers weeks before the show's end. Whenever ("if" ever) someone says something positive about this season, it's either shot down immediately or completely ignored. Whenever someone like myself questions why fans chose to read spoilers, or suggests people be more careful with posts, the response is like "Who cares, bro" "Go away" "You're crazy" "Breaking Bad's the best".
It's definitely weird in here, and as I'm sure most of you would agree, it's sad to have the show end on this note.