Lifelink is fairly easy to abuse, yes. But against an aggro deck it shouldn't be able to play that well. Control shuts it down, but aggro should be able to keep up with how quickly it gains life. You know what the real kicker is though? That crazy monk that gets +5/+5 and Flying is legal for Commander/EDH. And if you get him on turn one you have a 6/6 Flying Lifelink on turn 2 to start swinging with.