Just finished my first round with the uneven lies, and this was my take as someone who does golf a lot (usually 2-3 rounds a week) and am also fairly good (handicap around 9) so I know first hand the effect that the lies has on the ball flight.
As with most others it appears the effects are blown WAY out of proportion. With only a slight left to right hill (maybe a couple of degrees based on the graphic they give) I had to aim roughly 10-15 yards left of the pin from around 140 yards away, and it still went too far right (with a ding and small wind at my back). Also I feel i should point out that the ball being above or below the feet is more about what happens AFTER the ball is struck. If a ball is above my feet (right handed) it will start off to the left. However, AFTER the ball is struck it will continue to draw left. I did not notice this at all in the game, instead just noticed the ball starting really far to the left.
As for the uphill, downhill lies also seems to be over exaggerated. In the game I was hitting off a slight uphill lie (113 yards small wind left to right) and I picked up a club the hits 130 yards which was one club up from what I would normally grab. I hit a full shot with no spin added and it landed at roughly 95-100 yards. I may as well have been hitting into a 30 mph head wind. I would have had to go 2, maybe 3 clubs up to get that distance on only a small uphill lie. Not often when I am out golfing do I have to go more than a club up due to the lie of the ball, and when I have to, I am usually on a substantial hill (maybe 20 degress or so).
Having said all this I like the idea, and the direction this may take the game in. Nothing wrong with a little challenge, but this needs lots of tweaking. If the current effect the lie has in the ball was halved, It would be a lot closer to realistic. Please tweak, because I would love to see this in tournaments.
Joof