I'll probably be hated on and called a "weeaboo", but visual novels work great for older netbooks, especially those with 1024x600 displays. Thing is, most VNs use 800x600, and newer ones support 1024x576 as well, so in fullscreen (assuming you've enabled "preserve aspect ratio" in your GPU's control panel) everything will fit without upscaling, resulting in perfectly crisp text.
And even if you're not an otaku, there's still a couple awesome visual novels out there that even the average person could enjoy ("Fate/stay night" and "Steins;Gate" come to mind)