Overall, I think The Maze Runner series is an above average action trilogy.
I thought the first one was surprisingly good, neither of the sequels really hit the originality and cool vibe of that one for me. The sequels are totally fine and even have a few surprises but are far more traditional action. Lot's of guns, lot's of explosions (pretty much the whole last 1/3 of this final movie is the final boss battle and that gets a little exhausting). Great world-building, give those effects people a raise!
The acting is decent from everyone all the way through, Rosa Salazar was a surprise, commanding presence on screen (no idea what she's done before). There's a few funny bits but it's nowhere near over the top, which is good.
So if you liked the first two, you'll probably like this one. If you haven't seen the other ones, you won't really know what's going on.