Yeah, D-Tutor is really best in a powered cube where you really can just end the game T2-3 if you open land, Mox, D-Tutor.
Also, tutoring is fun unless you're the one watching someone else tutor for 10 minutes during your end step, so I prefer tutors with restrictions, like Pod and Teachings, where your target list is more like 5 cards as opposed to 30.