Taken from http://www.catalystresources.org/issues/351Walls.htm
WHAT IS WRONG WITH CALVINISM?
One of the most longstanding debates in the history of theology concerns the relationship between predestination and human freedom. On one side of this dispute, the most famous name is John Calvin, and on the other the most noted name is probably John Wesley. Although Wesley was primarily concerned with evangelism and church renewal, the very nature of his work required him to take positions on certain controversial issues. Perhaps the most significant of these involved his disputes with Calvinism; indeed, his work on these issues represents one of his most important contributions to historical theology.