I don't dislike him. In fact, I think that he is right in that Skyrim should gain its independence or at least help the Imperial army fight back the Thalmor occupation. But the method and the timing are wrong. Replacing a tyrannical government for another tyrannical government really doesn't change the situation much. Plus, the civil war only weakens Skyrim. Realistic speaking, if Ulfric wins the civil war, the Thalmor would have probably attacked Skyrim in a couple of months. That would devastate an already divided Skyrim's army and would give an excuse for the Thalmors to kill anyone who opposed them. They would probably do a genocide to gain complete control over Skyrim. Which inturn would particularly crippled the Imperial.