Deceptively difficult in the best way - on hole 1 I went "nah, this is easy!" and then proceeded to get sneak-attacked by a ball/club from behind. Incredible!
I think the animations carried this for me, though - the pop-in of the clubs, and the goofy flag-waving as you move, gave everything a bit of personality, which made it fun. I didn't keep playing past hole 2, but if you haven't already implemented this, I could imagine having later halls have like arced shots in the air and curved paths on the ground to make things even more unpredictable!