The graphics are okay and the hole designs are creative but the gameplay leaves something to be desired.
Carefully planning and crafting an approach to each hole followed by watching your perfectly executed shot drop delicately into the cup is the magic in mini-golf. This game lacks that appeal for several reasons. The controls are limited (you only control direction and power) as there is no ability to put backspin on the ball or angle the ball off of your club. The physics are cartoonish leading to frustrating moments where reality does not align with your plan. Additionally, certain objects and boundaries/walls within the holes themselves are not modeled very well and can never be trusted to bounce where one would expect (imagine running in an action-oriented game in a wide-open field then being halted by an invisible wall).
Edit: Realized this game was made in 2006. My expectations are lowered but the comments above are still applicable today.