First, the fight between Reacher and Paulie was way too long and drawn out. Professional boxers work out like crazy to get in shape for a fight but they need rest after 3 rounds and there are not taking the kind of beating Reacher and Paulie gave each other. I think some shows/movies make the mistake of making fight scenes or chase scenes too long. These are features of a show, not the plot. I get it. It's the big show down between two huge guys. and by the way, fighting in or under water is very strenuous and as a result your body burns oxygen faster. No one holds their breath under water very long while exerting themselves.
I prefer the scene in Raiders of the Lost Ark where Indian Jones is confronted by a huge Arab guy with a big wide bladed curved sword. Jones just pulls out his gun and shoots the guy. Prolonged unrealistic fight scene avoided! The fight scene in Reacher was so long the rest of the episode seemed rushed and squeezed in. Something like that is also satisfying. What Reacher went through in that excessively long scene was ridiculous.
Reacher killing guys in cold blood seemed a little out of character or something. If it was 1 guy maybe it would be something to overlook but this season he was a killing machine. When the line is blurred between the good and the bad guys, it is harder to root for the hero. And who keeps loaded guns on display in his house? And who hangs a fully loaded Uz (and a bunch of other assault weapons) on the wall?
I don't know what kind of glue Richie used to fix that toy gun, but modern glues set in minutes. Even Elmer's Glue would have dried by the time his dad tried to fake it with the toy. In fact, one of the problems people have with modern glues is they set so fast it often prevents getting a perfect fit with the pieces being glued. This is being a bit picky but to me it is lazy writing.
The shootout between the ATF and the bad guys where everyone is killed had too many head shots/kill shots. That was unrealistic. Nothing about that scene was realistic at all. Miraculous how every ATF guy in body armor is shot dead but Reacher and his pals all escape un harmed.
Again, I am being picky but all this stuff adds up to kind of turn me off to the show.