It would be better if groups differentiated based on DPS rather than ilevel, because a good player with moderate ilevel (70+) can pull 250+ dps on any DPS class. Good players will be admitted to groups more readily with DPS requirements than ilevel requirements.

DPS is also what is important, not ilevel.

@the above post: most people won't kick you in duty finder for bad DPS. Party finder, yes, but duty finder, no - you take what you can get.

Also if a DPS is constantly taking threat from a tank, the tank is in 99% cases at fault. Tank enmity generation ability in this game is extremely high.