Have to agree with you on this. Neal Stephenson is not a writer's writer by any means. But even by his standards I found the prose in Snowcrash to be plodding and amateur. I still love the book for its campy nature and for all the amazing ideas it birthed but it would have definitely benefited from a round of aggressive editing. Also the ending quite frankly was horrible, but I hear this is a general issue with Stephenson's works.
In general if you are new to Stephenson I would recommend reading Snow Crash first otherwise the transition from his other better written books will be jarring.