I'm with you half way.
The first episode was okay, nothing great and the show will be nothing but a procedural case of the week show. I do like that Monica was killed-off off screen. She was easily the most annoying character on Yellowstone, held very little relevance and was only around for eye candy. Kayce is probably the least interesting main character from the mothership so having a show dedicated to him wouldn't have been my first choice, but we'll see what happens. Marshalls will be successful only because of the Yellowstone tie-in. Drop in any other actor not named Luke Grimes playing a character not named Kayce Dutton and it would last a season or two.