the style
"quirky" doesn't cover it.
rucker's style is definitely cyberpunk; big and weird ideas, dashes of old-school science-fiction, part sociological thought experiment. his characters are not perfect, not by a long shot. technology is so advanced we would consider it magic if we were transplanted into his future. yet it's not all silicon chips - in fact you're more likely to read about sentient mold. the great tragedies are mostly to do with how people relate to each other; human or otherwise.
it's addictive reading.
Software, Wetware, Freeware, Realware
Read these in order, and be prepared for something very different. Few authors possess Rucker's skill for coming up with weird ideas; and this opinion is backed up by a well-read co-worker at the SF bookstore I used to work at. Rucker twists technology into organics and computers into beings; then twists the lines and blurs any distinction you might have expected. You might not want to live in his version of the future, but you are certainly in for an amazing ride if you read about it.