I agree. They are second in all of the NFL in average time of possession per drive, behind only Dallas.
http://www.footballoutsiders.com/stats/drivestats
This is a ball control offense, plain and simple. The intent is to keep drives going and to take their time doing it. By this metric, they have been very successful.
The coaches don't want to leave the defense out there more than they have to, which allows the defense to play above their talent level despite injuries--and they have the past few weeks. In fact, I don't have the article handy, but I read that over the last 6 weeks, the Lions defense has given up the second fewest points, behind the Ravens.
I think with a better defense and free reign of the offense, you would see something different from Jim Bob. But given the need to control TOP and keep the defense off the field, plus the fact that they have practically no running game to speak of, I think he is doing a great job.