Price issues aside, we, as a community, are better off with more stores like Gander Mountain (ie big box outdoors) than without. It helps normalize gun owners, hunters, and other non-ball-sport outdoors enthusiasts. Cabelas, BPS, Sportsman's Warehouse, Gander Mtn, etc are all very visible reminders that we exist and are a market force.
Their prices and selection weren't 100% bad in my experience. I've found good deals there but you have to know what you're shopping for. If you go in ignorant, you may end up paying too much.
Chris