Retired fat guy with a camera wrote:
It is not you, I had the same 70-300 mm lens. Mine was the non IS model. I got some great pictures with it. But, I always thought they could have been better.
I bought a 300 mm , non IS, f/4, L [ I read were it is sharper than the IS model] for 500 off of ebay. I like primes they are sharper and they aren't dust pumps.
Same camera, same settings, and I will tell you for the true, the L lens made all the difference in the world. It was worth the money.
That's not necessarily what I wanted to hear but I think you're probably right! There's so much difference in lens quality that it's pretty confusing for a newcomer. It doesn't help that I shoot with a friend with professional Nikon equipment.
Thanks for your time.