Experience it yourself.
I have now played through four story missions and am the 5th rank online so I now have a good feel for the game. I have to say when I first played this game I thought it was the best game that I've ever played and now it is certainly still up there, definitely the best FPS I've ever played.
At first you feel over whelmed with the great story mode, superb graphics and the immersive online play but after a few hours play you start to feel the glitches, however there is not enough wrong with it for it to lose a star.
The graphics are the best yet seen in a game and will probably be the best for many games to come, once you get a good feel for the controls they work surprisingly well and this is the first game that I feel has used to motion controls so that they are actually enjoyable, have a point and are not just frustrating and included for no reason.
I own all three next gen consoles so I am not just here as a fan boy, however I must say that my Playstation is my pride and joy and is much better than my 360 or wii. I am also a fan of the halo series but I have to say in my opinion this does beat halo, hands down without a shadow of a doubt.
All in all I would say that this game is a must own for all PS3 owners, especially fans of FPS games. If you are not sure about buying then it at least worth a rent.