Scale of MAG makes all other games tiny
Gameplay is flawless, the game is almost lag-free, it is very easy to join a new game, and the massive amount of players in a single map keeps me at the edge of my seat. Leveling system is awesome and make the game even more addictive.
Another element I loved is that you have a learning tree. When you level up, you can spend your experience points on special skill, guns upgrades or even new guns and gears. The nice thing about it is that you can re-spec only once in a while, which will force you to think carefully before spending your next skill point.
You will die a lot in that game, either by friendly fires, random bullets, bombs exploding everywhere, and snipers. But, at least for me, that did not spoil the game as you join the game again in sometimes only a few seconds.
If you love shooter games, you owe it to yourself to get a copy.