Remington is fine, just because there have been a couple of incidents doesn't mean they all do that. have any idea how many millions upon millions of Remington rifle uses that same trigger in the 700 model? The US Army and US Marines are still using Remington 700 triggers and actions for their sniper rifles. Remington has been making that trigger for 72 years now, over a long period with millions of examples and with people adjusting trigger settings (I always do) there is bound to be accidents.
The model 870 is the most popular shotgun ever made in the world, there are more than 10 million of them out there, if they all had trigger problems you would hear of far far far more incidents than the few you do. People like the 870 because it is cost effective, slicker than snot, breaks down to the molecular level in mere seconds, easy to clean, simple in operation and extremely durable. About the only pump shotgun that was better was the Winchester model 1912.