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The Japanese cast is real good, but the YYH voice dub cast does some amazing things with the roles their given. I won't say that they're better, per se, since I didn't watch too much of it in Japanese. But I will say that I don't think that there's anyone out there who fits the role of Yusuke more than Justin Cook, he does an EXCELLENT job. Though, I largely think that the reason that I like the English version so much is because of the script. I don't know who they got to write the dub, but they need to do more anime.
And it has Laura Bailey <3
EDIT: Eh...still, there wasn't really much Deus ex Machina. It was generally explained why they would get stronger then, and what triggered it would more or less be justified. I've never liked the "emotional power boost" either, but I don't really think Yu Yu Hakusho overindulges in it, especially when you consider what their source of power is. But regardless, it generally makes sense when its used, and they don't just leave it as "it's shounen, shut up." It's usually given an explanation or context, but without ever feeling long-winded or reaching Shippo/exposition levels.
...but TTGL is a special case. I hated it at first (which commanded an incredibly negative opinion of TTGL in the beginning), but then I fell in love with spiral power because of thematic genius.