look up close? of course.. it still has pixels, they are just smaller, and there are more of them. "Retina" is about how many pixels are in an area AND how far away you are. If you keep your eyes at what Apple calls a 'normal distance' then you will not be able to see the pixels... but if you look up close, yes, of course you can still see them.
If you are talking about "Retina" being the HiDPI scaling mode ("best for Retina")... running things at 2880x1800 scaled to look like 1440x900... well your games do not support that. If you go in a game and select 1440x900, then it is rendering it all at 1440x900 and stretching it out to fit 2880x1800 screen, and you are not using anything "retina" related. For games that don't support it (I don't think any do yet), then to get the full "Retina" effect you have to run the game at a full 2880x1800.