We've also already lost one of the small wooden road pieces, which isn't a quality issue, but it would be a great bonus if a few extra pieces were included.
The only complaint I have quality wise is the cardboard border pieces. The die cutting was slightly off so when assembled the board has a slight bow to it, making it difficult to fit all of the hexes inside. Over time it seems to be "breaking in" and is becoming less and less of an issue. It could also be fixed with a razor knife to trim a few edges down to make it fit better. We've also already lost one of the small wooden road pieces, which isn't a quality issue, but it would be a great bonus if a few extra pieces were included.