Before I start, let me note that I'm having trouble with my computer and unless I get it fixed soon, I might not be posting too much. I have about a week's full backlog stored, so you wouldn't notice until that ran out. I always say if I get hit by a bus no one would notice for a while. (BTW, I'm writing this from someone else's computer, but it's not that easy for me to log in elsewhere.)
Anyway, while I had my problems with Breaking Bad's finale (in that it was too easy on the characters and should have been more bleak), one thing that didn't bother me was lack of closure. If anything, everything was tied to much into a pretty bow.
Yet some fans and critics the ending was too open-ended, such as Hank Stuever in the Washington Post:
[....] We never got a full picture of what Skyler, Walter Jr. (RJ Mitte) and little Holly White’s lives were like during all that time Walt was hiding in New Hampshire. We never got to see how the DEA picked up where Hank Schrader’s secret investigation left off and how they began sorting (with Marie Schrader’s help, no doubt) through the tangled mess of the Heisenberg meth operation. … And we certainly could have used (and Betsy Brandt was plenty up to the challenge of depicting) more of the depths of Marie’s grief after Hank died. We had so much invested in all these characters and not nearly enough time for a payout; it was a shame, in these last few episodes, to always feel as if we were heading for the door too soon. I’m a sucker for fastidiously clean endings and also the beauty of epilogue.
We also didn't see Saul land in Nebraska, or Gus's funeral. So what? The show is Breaking Bad and it's not the job of the producers to show everything.
The essence of the show is Walt's arc (and to a lesser extent Jesse's and Hank's), from Mr. Chips to Scarface. In the pilot, we saw him barely making ends with two jobs and then getting a diagnosis of terminal lung cancer. The series saw him cook meth and build an empire. Then it all fell apart. Then he made amends and died. You can't have a clearer arc than that, and what happened to the main characters was also pretty clear, even if it wasn't all spelled out.
As for the investigation, the DEA found out from Marie and Skyler and whoever else knew anything that Hank was missing and probably killed, and Walt was Heisenberg, and whatever other information they had, which wasn't much (especially after the Aryans took Jesse's confession). So they searched for the bodies and searched for Walt who was in hiding. We know if was a big news story since Charlie Rose talked about it. We know they didn't find the Compound where Jesse cooked. (I do sort of agree about not much grief from Marie, but we saw some, and that story wasn't moving forward any more.)
The show, in general, featured all the closure you could hope for. Gus, Mike, Hank, Gomez, Andrea, Lydia, Tuco, Gale, Hector, Todd, Jane, Combo, Drew Sharp, Spooge, Uncle Jack and quite a few others--dead. Saul has relocated. Gretchen and Elliott will never quite feel safe again (they don't really deserve it, but that's how it goes.) Badger and Skinny Pete will go on their merry way. Ted is recovering. Marie is ready to be close to her sister again. Flynn will soon get $9 million dollars to help out himself and his family. Holly will never personally know her father. The two biggest question marks are Skyler and Jesse.
Jesse is free, and almost anything is better than what he just lived through. He doesn't have too much to worry about with the feds, since they've got nothing on him and now it looks like Walt was doing the cooking. He'll make whatever future he can. He's shown himself to be talented and hardworking, so he'll probably do okay.
Skyler still has to worry about her prosecution. However, the shootout at the compound, the capture of Heisenberg, the leverage she has in revealing where the bodies are buried and the lack of solid proof that she willingly did anything illegal, should either take the heat off entirely or give her a short sentence. And when she comes out, she'll discover Flynn is a multi-millionaire. She may suspect in the back of her mind Walt was behind it, but she'll get over it.