I shoot a pump action Remington Model 870 for sporting clays outings. I have never shot trap or skeet in a formal range setting. I thought on the first attempt at sporting clays shooting that my follow-up shots were disturbed due to the pump action, so I tried shooting a Remington 1100 auto on the next outing. I found out that it's not the gun, but my poor shooting skills....
I don't see anything wrong with a pump gun for skeet or trap. It's not ideal for follow-up shots but if you're like me, the gun is much more accurate than the shooter...