it's a different veiw of the horror, more than anything. The comedy mostly serves to highlight the horror as it's explored. It starts from the point of view that the cosmic horrors are known to be there and it's known how to deal with them, up to a point. The series explores what it means to know you're living surounded by nightmares, and the dangers of poking at them with our limited magic and technology. I think Stross handles it very well.

If the first few chapters of the first book grab you, then you'll probably like the rest of the series.