You think? You are probably right, especially if you look at recent movies (Clash of the titans and such), but the greeks, though they were very avant-garde, were overall not as successful as the romans and I love roman history :D
I think the greeks are mainly more well known because of their mythology, philosophers and scholars. But the romans had a better political system, a better army, a very awesome mail service (much more effective than what we have in austria >_>) and refined some ideas of the greeks and also had some of their own. They too had important philosophers (Marcus Aurelius and his self reflections, for example).
In the end, I think, the romans had far more impact on our world than the greeks.
Also, if I wouldn't implement either of them and just make something up, it wouldn't be known either :P