The problem with the last four years is they came up with a premise for the season and they thought that's all they needed.
Season 5 - A rich, successful celebrity is dumping women's bodies and Dex finds a survivor. Dexter teaches her how to even the score.
That little bit doesn't sound too bad. It's what they did with it that was lame. Lumen would have been more interesting if they didn't just turn her into the next girlfriend.
If they left her as someone who was self-destructing and Dexter - messed up from Trinity killing Rita - is fine with her self destruction. He's not going to stop her, he's just going to make sure she gets what she wants in the process.
No, they couldn't leave it at that, they had to make her 'normal' again. She couldn't just go out in a blaze as a cautionary example to Dexter. She should have died (horribly) and left Dex thinking about the direction he's heading. Her final act should be something her thinks about whenever he has someone on the table.
Also... Evil Tony Robbins was stupid.
Season 6 - Doomsday killer. A serial killer uses disturbing biblical imagery, building towards a Judgment day involving Dexter.
They start off with an idea that could be decent, but have no idea how to deliver. Dexter going up against a "movie villian" should be epic, but this season is unfixable from top to bottom. I could waste my day talking about everything that's messed up this season. There's a split personality gag we all saw coming from miles away. A wasted opportunity to use EJO. CGI gore. Deb getting the hots for Dex. Harrison is clearly a burden for the writers at this point so they just have Angel's sister always with him.
But the last episode ends with Deb seeing Dexter perform a kill. This should have been a game changing event for the show.
um, yeah...
Season 7 - Sirko/Firebug
This season they did two story arcs, and the first one was pretty watchable. Ray Stevenson and the gay hitman looking to kill Dexter (who killed Sirko's lover). Quinn has a lame b-story that gets in the way. If the writers would focus the first 3/4 of this season would have been solid. Dexter goes after a Jigsaw killer style clone, also entertaining. The season really ends with Sirko's death, then there's 3 or 4 episodes about the firebug who just isn't that awesome. Also there's Hanna. Eyecandy, pointless character.
Deb totally wusses out and help Dex cover his tracks for last season. LaGuerta goes into irritating character overdrive. She's so unlikable Angel divoriced her - BETWEEN SEASONS!! When Deb has a gun pointed at her I remember thinking "DO IT!!!" At this point the show feels like it's gone past it's shelf life.
And of course season eight happened.
Season 8 - Who give a sh-t? Hey, let's build our major story arc around the most worthless character from last season, Hanna McCay!!!
Dexter becomes a secondary character on his own show. Musuko's daughter. Deb and her boss. Quinn trying to become captain and getting busy with Angel's sis. Angel waltzes back into his old job to find his ex-wife's killer, which he spends no time doing. Hanna shows up and poisons Dex and Deb "oops, sorry." Deb attempts to kill Dex - "oops, sorry". Dr. Vogel tries to bore the audience to death - "oops, sorry"
Lots of noise and running around, none of it feeling very important. Deb basically dies off screen of an emalism and Dex pulls the plug to finish the job. (I guess that real life divorice did leave some hurt feelings)
In the end Dexter fakes his death and Alfred finds him sipping tea in Florence. Looking like a lumberjack. Whatever. Talk about pulling stupid sh-t from your ***, what an ending.
When Scott Buck took over as head writer there should have been a plan. I'll never believe this was anything other than make it up as you go along.
At some point I'll re-watch seasons one and two, maybe four. But that's all. Watching this show felt like toughing it out rather than something I looked forward to.
Lesson learned - Next show I watch that takes a nosedive, I'm out. There was no return to greatness for this show, and audience loyalty was not rewarded.