I sort of bought my SP3 (i5, 25gGB, 8gb) without weighing everything but I don't use the thing for gaming that much. But what's wild is I have a VM running Windows Server 2012 on my SP3, and I am able to run business intelligence and analytics software with NO problems. I develop those applications. So I was pleasantly surprised. And I have been using the SP3 as my primary machine since I bought it. My iPad and MacBook Pro Retina still get used but seldom - but mostly for games. So I'm pretty happy, save for some of the lousy updates MS has been pushing to our devices.
There is one complaint about gaming that surprises me (and maybe someone can shed some light on this). Some Facebook games, like Dice with Buddies or Bingo Bash, run slow as heck on my SP3. I don't understand why though - they don't seem to be that graphics or processor-intensive, but they run awful. The Android versions of these games run faster under Bluestacks, which is pretty weird. It's not a priority with me, but it just puzzles me.