Sure, it's repetitive, sometimes a little boring, and it lacks a lot of the extra things you could go do in the city in RDR and GTA, but I seriously enjoyed everything about it. The cases were all fun, the voice acting and facial animations were top notch, and the I definitely felt like I was a cop in the 40's. Plus, an amazing ending didn't hurt either.
I sure wish it didn't take as long to get the full 1400G though. Shit took forever.