I've seen other Let's Plays of the videogames, so I had some idea before seeing the movie.
Nathan Drake is a wee baby who joined up with Sully to go on a treasure hunt. The fetus gets involved in several slapstick moments, culminating with the gleam in the milkman's eye sailing around on a boat.
I keep going on about the youngness of the lead because the movie sure as hell bangs the drum enough about it in order to pretend that Marky Mark is old enough to be Sully. But yeah, the treasure hunt nature of the movie reminds me of a lot of other similar movies, but then the video game was also just another take on action/puzzle games. (Hey, Tomb Raider but with... get this right... a while male protagonist!! What a twist!!!)
Which isn't to say it isn't enjoyable, just that to me it didn't really hit any new heights. The characters all proclaim themselves as selfish, so I have no investment in them as characters, so don't really care when they get betrayed as they are quick to do that themselves. And the action set pieces feel like action set pieces that could have been swapped in from and other similar movie. (I keep wanted to say "National Treasure".)
The best thing I will give it is that it doesn't try to overly pad out the movie, and is a decent two hours and done.