I enjoy Tutors in Cube and love how most of them don't fit into most decks. No way Gravecrawler beats wants Vampiric or even Demonic Tutor. However, their applications are broad enough that they are not poisony -- you can Mystical Tutor for your Reanimation spell, sure, but also for Terminus or whatever. I like decks that have intricate webs of synergy and like that Tutors can help bolster those webs -- Cube decks could use more consistency than is offered by the norm; that's why we have 4 Brainstorms, 4 Gravecrawlers, extra fetches and so on, it's fun if both decks at least try to do something every game, and there's no way to build a Cube in such a way that DT, easily the best of them, would be an issue the same way it would be in any Constructed format.
That being said, I go back and forth specifically on DT. The power level of the Reanimator decks is high and I don't want to make it higher, maybe this suggests I should curb Reanimator but then my graveyard themes would be weakened and uh I'm not really sure. On the other hand, decks like "Imperial Recruiter for Eidolon of Blossoms, Academy Rector for Pharika, try to Resto + Kiki somehow" dependent on super-sweet tutors that are still conditional, could use the extra help. I don't have DT in but based on my context there are arguments for both sides. Without high-power combo decks, in slightly more streamlined and faster environments like Wadds's, I'd run DT for sure and expect it to be a lot of fun.