The stock radiator is two 1" thick copper rows. My custom 3 row is... um... well... three 1" thick copper rows.
Most aluminum radiators are three 1" thick aluminum rows. That have thermal conductivity numbers way short of copper.
So, is the factory radiator "dinky?" No, more like you like to buy shiny stuff LOL.
Did you get a long warranty? Are you going to go spank the dog crap out of it in the 110 degree weather like my test bed? No, quite likely after a few trips to car shows and 7 coats of wax later, you'll say it's a great product.
LOL