A++ on explosions. Would frost nova again.
There's lots of fun abilities, but it comes down to clicking on monsters and collecting loot. The dungeons are mostly randomly generated, and there is a perma-death option if you so choose, but eh, I don't get why people call it a roguelike. The story is predictable (like holy crap predictable) but the cinematics, world development, and voice acting are great.
If you like killing absurd numbers of monsters and collecting phat loot then you would enjoy D3.