Since you are in Oregon and I am in California, you are probably used to a lot more rain than I am and are more sensitized to the issue. However, with that said, I wouldn't be too concerned. My tent has a similar style vent. The inner fabric goes up under the upper fabric and prevents leaks with normal rain. With wind blown rain, the Velcro creates an area of overlap that effectively seals it up. If you expect wind blown rain, you can orient your feet into the wind and keep the vent on the down-wind side.

I checked out the reviews on Amazon. They seem pretty positive. Neither of the two negative reviews focused on leakage at the vent port, so it doesn't seem to be a common user complaint.