I never played Catan so that may explained some of my difficulty.
I had to install Net and XNA as expected. It would be nice if I got an error message saying which component was missing but I understand that might not be possible. You might want to look at the free Inno installer.
The game ran fine on my Windows 7 desktop.
The music and graphics are excellent.
I started a game, it was not clear that I was selecting a scenario or that the scenario was a tutorial.
The tutorial told me what to do but not where to do it and more importantly why to do it.
I couldn't get into the game because I had no idea what I was doing or why. I would like to be able to access help information from the menu that would include; - Game/scenario objective - What I can build, their benefits and cost - What the resources are and how they're collected. - List of keyboard shortcuts (if any)
Great start, just needs a little more explanation.