I'm a huge fan of Internet Explorer since Microsoft launched its 9th version on 2010 (or 2011, can't remember). Just loved the way they used DirectWrite to render fonts.
Recently, I've seen a lot of people complaining about blurry fonts when they use IE 10 or 11. I couldn't see those blurry fonts back then because I had a 1366x768-resolution laptop.
I started noticing such annoyance when I bought a 1920x1080-resolution laptop. GOSH, things on IE and Office 2013 where BAD AS HELL. So I started doing some research and saw that some people were upset about it and some people didn't even notice. Got into some Microsoft discussion threads and MS engineers kept telling people they couldn't see any difference between screenshots costumers posted.
And then I came by one MS staff saying on a thread that people should calibrate their video. And I thought: "well, since IE uses grayscaling rendering, it has to do with the way my monitor shows brightness and stuff". And then I found the solution: I had my GAMMA set too low. This way, my grayscaled fonts looked bad rendered because I could see black parts of the font that should be displayed gray ou almost white.
So, you guys just have to adjust your GAMMA SETTINGS a little higher and you're gonna have font rendering as smooth as Firefox!
Hope I helped you here!