If you put your active way point on top again and execute, the box will recalculate your descent path interpolating between actual wind at your current level and a) zero wind at E/D, or b) any winds entered in descent forecast page. So what I normally do is to have a look at the wind charts, and take note of any large changes in W/V and more importantly establish early if you can expect tailwind during initial approach. Put this into forecast page.
Then, the V/S information is only useful for a geometrical path without any decelleration. For an approach it works perfect. It basically converts your vertical bearing to the next descent "target" waypoint. You will often find that using this V/S will gradually bring you higher and higher, but you will end up at the waypoint at the correct altitude/FL but with excess speed.