Originally Posted by
Eled.
"Retina" is indeed a word used for marketing rather than a specific kind of technology, or even a technical norm.
It's just that your 13" MBP has the same resolution as a 27-30" display, 2560x1600 (on the software side these pixels are used in a way that differs from traditional resolutions, but there's nothing special about them).
And if you want good performance on a 27" display, you need a pretty decent GPU. In that regard, the 13" MBP is way off the grid for gaming performance, it's just not powerful enough.
Anyway, I don't consider it a problem if you don't want "über-superior graphics" : just don't play in retina resolution. Play in 1280x800 or 1440x900, it'll be the same as playing on a non-retina screen and you'll have better performance.