First of all, whose bright idea was it to translate the name of the show as "Money Heist", Netflix? Original name, which directly translates to "The House of Paper" is vastly more fitting (well, at least for the first few seasons where they were actually stealing paper). Spanish name invokes that "it's just a paper" sentiment which is at the core of the whole show. English name is so uninspiring it's like they didn't even try.
Spoilers ahead! You have been warned.
Now that out of the way let's discuss season five.
Frankly speaking the start was pretty slow and seemed like creators run out of ideas. We've got few more Gandia's for antagonists (seen that), Arturo stages coup (been there) and constant flashbacks to the Professor's and Berlin's past seem out of place and almost a fan service. Everyone like Berlin, right?
Yet, bit by bit the story unfolds and the second half of the season (maybe even two-thirds) had me on edge pretty much entire time. Tactical action of fighting with military squad was just a start, and stakes by a lot due to Tokio dying. Tokio was the first character introduced to us in the season 1 and definitely a fan favorite. Sure, in a show filled by dozens of interesting characters it's hard to say she was the protagonist (I would give that honor to Professor), but she was such an iconic character that her death made viewers think "whoa they're not playing around". Season 5 is the final season, so nobody's safe.
Closer to the end of the season two awesome plotlines kept me glued to the screen: primary plan unfolding and Alicia transforming from an antagonist to a something like a Professor's right hand, hm..., woman. First about Alicia - it might've not been the most realistic transition (happens in a span of what? Like a day?), but damn was it fun to watch. Alicia is such a powerful character that you're just happy you don't need to hate her anymore!
Main storyline and Professor's plan was surprising and totally unrealistic. I liked it still, because Rule of Cool. Do you think Spain's economy would collapse because somebody stole a bunch of gold from a vault? Financial institutions know well enough that country's worth is not tied to its gold. Not in 21 century.
In the end I was surprised to see a (kind of) happy ending to the series. Most importantly, the story has been told in full and the show maintained it's quality till the very end, which doesn't happen that often these days.