Well the 870 has just recieved a reputation for being a great gun. The price doesn't hurt things either. I've owned several pump shotguns, 2 were Remingtons, and I still own 1. They were far and away a better feeling gun, with no issues to write home about and they have always just worked. (
The only exception was this past Fall, it didn't like the Federal black cloud ammo and the slide would kind of get stuck when trying to eject it.) I don't think the media has a big role in what kind of gun someone buys as far as brand. I mean lets face it, if you see a tv show or movie, it's almost always a military style rifle their playing with. Although I do recall an episode of Miami Vice where a bad guy sniper uncased a 742 Remington, attached a scope with weaver rings, 'adjusted' the scope adjustment caps,

D) and killed somebody. I think most people select their weapon of choice based on a few things. First would be what their Dad/Uncle/Grandfather shot. If it was good enough for them... Then there are the guys who just like the look of a certain gun. Then you have the guys who buy what they are told to buy. Come to this site as a newbie and ask what should he get, the answer will almost always be a bolt action rifle of some flavour. That's why they are so popular. I don't think they are really better for hunting, but they have become the most popular simply by word of mouth. I personally prefer lever action rifles myself, but that's probably because of too many Western's growing up. And that's probably the same reason new guys to shooting like the military style rifles. The media won't cause someone to choose a brand, but it can help choose a style. And while
any rifle will kill a deer, it's simply a matter of personal choice. And I think selecting the right rifle shouldn't be left to others to decide for you, that is somthing you really need to decide on your own. I think a rifle shouldn't be seen as merely a tool, rather an extension of who you are. And if a pump does that for you, go kill a deer.