I almost posted this the other week but deleted it, figured I might as well FWIW. I suspect that the majority of the people who buy into celebrity endorsements aren't buying top of the line products, and the people that do buy top of the line products don't want someone's name and picture on them.
I shoot a Mossberg 835, and find it humorous as it is one of the least expensive guns I own, yet has probably been shot 10x as much as any other. At one point I sold a truck and had a bunch of cash burning a hole in my pocket, I decided it was time to buy a better quality shotgun. The Benelli's I held felt like a bony anorexic girl that doesn't ever eat, the Beretta's felt like a chubby girl that was hard to get a good hold of, and the Browning Cynergy felt sharp and mean up against my face, so I'm still shooting the old Mossberg.
Granted, I probably would have gotten used to any of the other guns eventually, and I can't knock Benelli as many of my friends shoot them, and have held them underwater to melt the ice off them in sub-zero conditions, but my Mossberg has never let me down.
I typically enjoy very refined things, I shoot Weatherby rifles and drive European cars and motorcycles, but if you define a good shotgun as going "bang" when you pull the trigger and loading another shell after that, my Mossberg has done exactly that. 6,000+ rounds and it has never had any issue whatsoever, I never even clean the thing.
I freely admit that there are better guns when it comes to craftsmanship, and I've been embarrassed to show up at certain quail hunts with it, but I think that they are similar to Savage rifles in that they do exactly what they are supposed to at a great price.