I wouldn't call it dry. I thought the writing style was a little juvenile, but the ideas are generally interesting as you said, the descriptions of technology are fairly detailed and I thought of it as a rollicking adventure by the end.
Dry implies flat and drab to me. If anything, I think Stephenson's flaw as a writer is that he comes across as an excited boy who just wants to tell you everything he's been researching, rather than show you naturally with a well-written story.
I was totally engaged by Seveneves, right up until the time jump, at which point I completely lost interest. The hard rain stuff at the beginning is totally fascinating.
https://en.wikipedia.org/wiki/Seveneves