True, It's mainly genetics but you can improve on what you have...
I had really shitty calves and legs (still not my strong point) but keep on training them as hard as I can. These two pics are 10 years apart (2000 and 2010) and they're still improving now. For calves I only use pressing on the leg press (one foot at a time - 5x5 heavy) and seated calves (reverse pyramid - 6, 8, 12 reps) Once a week...controlled full range of motion, I also pause for a few seconds at the bottom of each rep (takes out elastic recoil of the achilles tendon)... I think calves also get worked indirectly hard from heavy squats and deadlifts... seen some power lifters with massive calves, who never train them directly.