They are OK.
They have terrific prices on ammo when they have a sale, average the rest of the time. Selection is fair.
Guns? No handguns (around here anyway) and they only have "sporting" guns in long arms. If you want a hunting rifle in a standard caliber (.223, 30-06, .270, .243 and sometimes .308) you are in luck. If you want a .22lr or a shotgun, you are in luck. You want an AR, or even a Mini-14, you need to go elsewhere. Their prices are usually pretty good, and when they are having a sale their prices can be great.
Tents? Their name brand tents suck, the main name brand they carry is Coleman (i.e. they are fine for the average family, but not for serious campers). Similar deal with other camping equipment.
Fishing? They have a nice selection of fishing gear.
General sporting goods? They may not have a lot of any one thing, but they carry a little of everything (weights, baseball gear, soccer gear, swimming gear, lax gear, etc.)
Service? Like any big box store they don't pay much, many people are young students or working a second job, and quality of service can be all over the place (I've walked out after waiting for help with ammo for 30min and no joy, I've had some great experiences with people at the gun/ammo counter). Being specifically a sporting goods store that includes outdoors "stuff", they tend to get people into sports and/or the outdoors who apply, thus some of their employees actually do know their stuff.
Being that most sporting goods stores no longer service the shooting sports, I do like to occasionally stop in and buy something. I often buy ammo there, and I've bought a shotgun and a rifle there. If we support them, they are more likely to continue stocking such items. The more that stock such items the better (this is why I occasionally swallow my pride and buy ammo from Walmart as well despite generally hating Walmart).