An orgasm is good, but I feel like it doesn't hit that point of "really good sex" until she's multiple (perhaps double digits) orgasms deep, you're both just totally captivated by eachother's bodies, and there is nothing going on except the amazing harmony between the two of you.
A deep, powerful orgasm is gonna be what she remembers during all of that. That's what she fantasizes about for years after.
Being able to make her come quick might be somewhat impressive, but her soul will yearn for you from those body spastic, screaming, and shaking ones. The ones that get that bitch cock drunk.