SummarySokoban dungeons - you have got to be kidding? (Fortunately not!)
The GoodThis game has it all - including the proverbial kitchen sink.
The BadIt's very _very_ VERY difficult. Like, V-E-R-Y. Just when you think you're going to make it, you get stuck on some devious sub-levels, or choke on your food, or find a treasure zoo (more like a Pet Cemetary, usually), or... Hey, why did I write this under the "What _didn't_ you like"-heading - the unpredictability keeps you humble.
Then again, you might complete the game in ten minutes. It's just a matter of not dying, really...
Uh, what was it that I was supposed to write about again... oh, yeah, here goes: you find loads more interesting stuff than you can ever hope to carry (most of them are cursed, anyway), the plot isn't too good (so you might as well have no plot at all), there aren't any interesting NPCs (or I haven't found them yet), and the mouse control (sic) is pretty useless (though I guess that's pretty much a truism).
The Bottom LineRemember what I said about "NetHack" having it all? Well, it weren't no lie. NetHack has more depth and lastability than any other game I've seen. Because it "only" has character graphics and no sound at all, and because it is not a commercial venture, the developers have managed to fit so much little (and big) features in the game that you really don't pay much attention to the fact that the point of the game is just to kill a lot of baddies and explore one-screen dungeon levels until you can beat the big baddie. Well, actually, there is a lot more to the game than that, but you'll just have to find out for yourself, won't you?
In short, NetHack is to Rogue or even Hack what Dom Perignon is to Champale. (Haven't tried either one myself, but I've seen ads...)