Couple things about the 28....I had a Ruger in 28. Extremely light, about the same as a moderate sized .22. Very quick. I got over 50% on doves with it. I think that you subconciously know you've got less shot so you've got less range.
That said, IIRC you can get 1 oz loads, so that puts it in the same class a target 12's and 20's in a smaller, faster gun. Downside is shells are maybe 3x the cost of 12's. If you shoot a lot, the recoil would work you over due to the payload vs weight.
I ended up trading if off for a 12 O/U as I was getting into SC and the price and availability of shells didn't work. If you want something fast and light for upland work, it would fit the bill. I can't see getting a full frame gun in 28. YMMV.