The main problem with IE wasn't that it was an exclusive product incompatible with other browsers. The problem was that it was bad. I'm not a fan of people only supporting WebKit, but at least WebKit browsers are good.
IE was an attempt to aggressively eject the competition and kill the open web. When the web stubbornly refused to buy into IE-only technologies, it became Microsoft's dog in the manger, holding back the day that web apps made the OS irrelevant. It was good, technically, and then it was bad, technically, but it was always always evil.