Season 5 was the worst of the series, however, it was still better than the best season of Dexter.
The newspaper angle wasn't that enticing, and the serial killer thing was pretty convoluted and unrealistic for sure.  The resolution of the storylines and characters though was great.  It was a good final season and end of the story for the characters we got to know and appreciate.  Not as good as Breaking Bad's final season, but better than the Sopranos IMO.
100% must watch for any fan of the show.
ETA:  HBO hamstrung the final season.  It was written for its normal 13 episode run, and then HBO made them cut it to 10.
		
		
	 
Unless David Simon is lying, that's not the case. He said HBO asked him how many episodes he needed. He originally said 10, then later asked for 10.5. HBO said he could have 11 if he wanted it, but he declined:
In terms of priorities, how was the storytelling different, did any stories have to be abandoned when it wound up being a 10-episode season as opposed to 12 or 13?
The main stories were told exactly as they would have been. By the way, I was given 10 and a half. When I realized I needed more than 10, they asked if I wanted 11, and I said, "No, I need 10 and a half." If I said I needed 12 halfway through the season, from Carolyn (Strauss) at that point, I could have gotten it. They came to me early on, I asked for an extra episode, a 13th, for season four, because we had to add some elements of the political spin-off that didn't get made, so we had to deal with the election and the schools in one season. So I asked for 13, and they gave it to me, and then when we came back for the last season, they said, "School story's over, election's over, you have this one remaining theme, can you do it in less?" And I said, "I think I probably can."
But it was an open question. They said, "Can you do it in 8?" I said, "No ####### way." They said, "How many do you need?" I said, "I don't know. Maybe 10. Maybe 11." So they said, "Okay, beat it out, see what you need." I told them 10 after I beat it out with Ed -- and, by the way, this is also in a year when they're giving me 7 hours of "Generation Kill," so they're not being parsimonious -- and then as we started making it and got towards the end, I realized I might need more story and I said, "Can I go to 10 and a half? Can I do a 90-minute episode if I have to?" And they said, "Sure. Tell us which one you need." At that point, I'm one hour away.
If they gave me 12, and said you have to take 12, then the truth is, certain storylines that were branches on the three that couldn't be serviced in 10, like Prez and Cutty would have had storylines. The main storylines would have had no more or no less work done on them. We said what we wanted to say on them. We would have had more time to service characters who at that point had become peripheral but were favorites of the writers. But at the same time, we talked about it, the writers, and we realized Prez has reached his stasis, as has Cutty. What redemption there has been for them has been achieved, and that's where we want to leave them anyway, so all we're doing there is gilding the story a little bit. A decision was made that that's not really what needs to happen here with the story.
But the truth is, if I'd have gone to Carolyn and said ‘Look, I'm too tight,' then she would've fixed it. She would've helped me fix it. And in fact when I did go to her and said, 'I'm too tight. I may need 11, I may need 10 and a half,' it was like, 'Do what you gotta do.'