Well, admittedly, I'm having a much better time with the game than I did when I tried the Japanese version out. Trying that version got me excited for the game because, just from the hour or so of playing it, I could tell it was very much in-line with Diablo. And now that I've been able to play through a considerably larger amount of the game, I'm enjoying it quite a bit. It's definitely a button-mashing hack & slash, but it does it pretty darn well, especially for a DS game.
Yeah, the graphics aren't great, but they're not bad, either. Videos don't quite do it justice, though. If you use the Select button to zoom out to its furthest view, everything looks pretty cool, actually. The framerate is about right on par with the first Diablo game, and using the R-button to lock on to enemies makes attacks a lot easier (since the framerate can make diagonal attacks a tad difficult).
So far, there's a lot of variety in the environments and customization -- again, with consideration to the fact the game's on the DS -- but my main gripe is that sometimes you can end up sandwiched in a mass of enemies, getting raped against a wall, unable to move. However, that happened often in Diablo II, as well.
Definitely one to check out for fans of this sort of gameplay.