I found Foundation quite boring too, although the dated technology was kind of charming. At least he had computers with visual displays. I also read Heinlein's Farmer in the Sky earlier this year, where they still use slide-rules.
I quite enjoy some of Asimov's work, but I don't think I'd really waste much time defending the quality of his prose. I was just thinking the other day that Asimov's The Gods Themselves and Ursula K Le Guin's The Dispossessed both feature the internal politics of scientific progress as major plot points, and won the Hugo award just two years apart, but stylistically they could hardly be further apart. The lumpen Asimov seems from another era, compared to the Le Guin, and I'd say it was one of Asimov's best. For all that, I enjoyed both of them; they just have different virtues.