If you're expecting something akin to
a 2016 version of Raiders of the Lost Ark, you'll be disappointed. It had a lot of starts & stops for me.
Like, "Ahhh, here we go! We're deep in the Amazon drifting along the treacherous river on a makeshift raft with little more than what can be carried. Not only must we survive the natural elements, but LOOK THERE! Naked natives are sniping at us with arrows & spears from ashore! This is really picking up & getting good.
Nope. Abrupt scene end. Aaand now we're back in London all cleaned up wearing a three-piece suit whilst giving a speech to a room full of well-coiffed, 'pip, pip, here, here' dignitaries some months later."
This type of sequence plays out several more times before reaching the anticlimactic conclusion.
After 2 hours 20 minutes, it's not unreasonable to expect to finally see this magnificent, abandoned, ancient, city ("of Z") deep in the Amazonian forest. But, again, you'll be disappointed. Rather than our trusty, British explorers peering through vegetation whilst operatic music accompanies a slow-zoom camera shot bringing into eventual focus a city not unlike the mythical El Dorado, you get a casual stumble over a few pieces of broken clay.
Before presuming that I just do not like these types of movies, it should be known that my #1, favorite movie of all time is Schindler's List. I simply did not care for this particular movie.