It's funny you threw in the comment about Asimov, though I'm not sure how to take it. I've always greatly admired Asimov, both as a writer and a human being. I've really liked his ideas and recognize the huge impact he's had on the genre of sf.
But his writing style - meh. Not since being a teenager with limited titles available at the library have I willingly read much of his fiction. In reading comments over the year, I find that I'm not alone and this seems to be a general consensus.
There are some authors who I still read even with bad writing styles, simply for the fantastic ideas. I will never make the mistake of reading another Robert L. Forward title again, though. I never thought I could be so bored and interested at the same time.