Wesleyan Arminian rounds up some good quotes by Calvinists against Arminians. A few:
Charles Spurgeon: And what is the heresy of Arminianism but the addition of something to the work of the Redeemer? Every heresy, if brought to the touchstone, will discover itself here. I have my own private opinion that there is no such thing as preaching Christ and Him crucified, unless we preach what nowadays is called Calvinism. It is a nickname to call it Calvinism; Calvinism is the gospel, and nothing else.
John Piper: Here’s my rule of thumb: the more responsible a person is to shape the thoughts of others about God, the less Arminianism should be tolerated. Therefore church members should not be excommunicated for this view but elders and pastors and seminary and college teachers should be expected to hold the more fully biblical view of grace.