Yes at first glance, Thori'dal appears to be so far over powered that its unfair, BUT!!!!! You can't equip arrows, and since most ammo provides a +DPS bonus, it equalizes itself out.
Although, if you remember Steady Shot and how it functions off of base weapon damage and how the dps from arrows is ignored, you'll see that Thori'dal will get a HUGE boost because of that. Steady Shot is used just about as often as auto-shot, and if you add the 53 dps to the Steady Shot alone, you get a big dps bonus. The fact that it doesn't need arrows just makes it that much stronger!