I've noticed the same thing. Screen text is fuzzy because of antialiasing. If you load up an image, unscaled, with aliased text and antialiased text, you'll see that the screen is crisp and perfectly representing the image as it should be. It's when the tab tries to render text that it fuzzifies everything.
One thing that significantly improves readability is an anti-glare screen protector. I found one on Amazon that is pro quality and extremely affordable. Search for Generiks TM Samsung Galaxy Tab 8.9 and you'll get it.
Captivate SGH-i896, Galaxy i9000, Galaxy Tab 8.9 SGH-i957, Galaxy Tab 7.7 P6800, Galaxy Note i717, Galaxy Note N7000
Note 2 i317 (AKA the perfect phone) | Nexus 7 | Nexus 10 | Nexus 4 | Galaxy S4 M919