Don't get me wrong, Dakworld relies on a lot of daring play, Imagine using Broww to summon Wu-Gold in 1 turn but cards like Disappear and Big Burn can easily screw a guy's game.
With the Classic Fiend approach, its a healthy Beatdown-Effect combo, and with some of the stronger Fiends unresurrectable like Dark Ruler, Helpoemer and Necrofear being unabled to be summoned from the Graveyard (yet) so you can eliminate the fear of having your opponent use your own monster against you. One of the reasons I dropped Premature Burial and Call of the Haunted from Fiend Deck.
I like the new Alien cards though. Very interesting style of play. Not tournament caliber stuff but cool and fun.