Now that I've re-watched the finale, I'm closer to the camp that thinks that it's nearly perfect. Personally, I would have preferred that they go into more depth on particular characters and just drop some of the others (Lydia, the Schwartzes, hell even Todd if necessary). But watching it now knowing that Gilligan was seriously determined to "resolve" every single remaining significant character, the whole thing clicks together really well. I still love the ricin part, and the scenes with Skyler and Jesse are great. Walt lucked out with regards to the Nazis -- by all rights he should have been killed unceremoniously -- but he's always been lucky with his adversaries so that's completely fine. I can even tolerate the laser pointers on Gretchen and Elliott now that I've talked myself into the idea that this is Heisenberg's last stand.
There's still a lot of highly improbable stuff here, but finales get more suspension of disbelief than usual, and I think they nailed it. The epic moments, like the wall between Walt and Skyler, the way Walt explores the Schwartzes home thinking about how this could have been his life, the nod between Walt and Jesse, and the last scenes with Flynn and Holly more than make up for the stretches. And I still think Jesse's ending was pitch-perfect.