1) There are serious differences between us, but Arminians are not Judaizer's, or Gnostic's. They believe in the Apostle's Creed, the Nicene Creed and Athanasian Creed. They (some) love the Jesus of the Bible above the things of this world, something natural man cannot do. If someone holds to the most basic fundamentals of the faith and has a true affection for the Christ of the Bible how am I to consider them heretics? They may go wrong in some areas but they are still in Christ. I don't believe ALL Arminians are saved, but I don't believe ALL are out of Christ.
2) I admit, at times I want to be in people's favour (I'm sinful!) but my hope and prayer is that I am out to honour God. And so as I am to love my brothers and sisters in the faith - those whom God has quickened (even if they don't realize it) - I get uncomfortable denouncing ALL Orthodox's (including most Church fathers), ALL Catholic's, and MOST modern Protestants as goats and wolves.
3) Luther's 95 Theses is more against the practice of indulgences than against free will. I don't even think it mentions free will. I'm far from an expert on the Reformation, but to my knowledge although free will came up later on (and was a very big deal), the Reformation began because of the corruption (relics, indulgences, purgatory, penance, the papacy etc..) within the church. So to say free will was the whole reason seems to be a bit dramatic.
To your first point, what Reformed Confession do you hold to? Because if we hold to a 17th century Reformed Confession we would judge the Arminians as heretics. For there is only 1 gospel, 1 baptism, 1 Lord. There are not 2 which may be up to the chosing of your "free-will". Whenever anything is added to Grace, Grace ends being Grace and becomes debt. This is what Paul stresses in Romans
Rom 4:4 Now to the one who works, his wages are not counted as a gift but as his due.
Rom 4:5 And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness,
Rom 4:6 just as David also speaks of the blessing of the one to whom God counts righteousness apart from works:
Rom 4:7 "Blessed are those whose lawless deeds are forgiven, and whose sins are covered;
Rom 4:8 blessed is the man against whom the Lord will not count his sin."
And,
Rom 4:16 That is why it depends on faith, in order that the promise may rest on grace and be guaranteed to all his offspring--not only to the adherent of the law but also to the one who shares the faith of Abraham, who is the father of us all,
As for your third point here is a passage of Luther from his Bondage of the Will. He talks about how the whole Protestant Reformation swung on the hindge of the false view of "free-will"
In this, moreover, I give you great praise, and proclaim it -- you alone in pre-eminent distinction from all others, have entered upon the thing itself; that is, the grand turning point of the cause; and, have not wearied me with those irrelevant points about popery, purgatory, indulgences, and other like baubles, rather than causes, with which all have hitherto tried to hunt me down, -- though in vain! You, and you alone saw, what was the grand hinge upon which the whole turned, and therefore you attacked the vital part at once; for which, from my heart, I thank you. For in this kind of discussion I willingly engage, as far as time and leisure permit me. Had those who have heretofore attacked me done the same, and would those still do the same, who are now boasting of new spirits, and new revelations, we should have less sedition and sectarianism, and more peace and concord. -- But thus has God, by the instrumentality of Satan, avenged our ingratitude!
Luther, Martin (2010). The Bondage of The Will (Kindle Locations 4346-4353). Unknown. Kindle Edition.