One complaint I have, is I have lost multiple games because I got colors confused. Nothing's worse than saving up red cards and suddenly realize you're trying to build an orange line. Ditto purple and blue. I notice they mention this at the above-linked review, so it might be an issue above and beyond my color-blindness. Early on, I also made some mistakes about city locations; the name of the city would appear right above a dot, and I wouldn't realize until it was too late that the label actually applied to the dot towards the left. But I soon got that figured out, and even the color issues aren't as bad now that I'm aware of the problem, and since the colors are static, I've pretty much memorized the more troublesome routes. Catan, to its credit, has a color-blind mode, optional offline and standard to ranked online matches, which helps me out.
But yeah, if you have an Xbox 360, check out both games, if you haven't already. I always feel a little silly, having bought an expensive video game console, only to spend most of my time playing simple board games on it. But they're hella fun, and Catan in particular is brilliantly executed, and the computer AI makes for a skilled opponent, mostly.