If you love Diablo 2, you'll love Torchlight
It's as simple as that. The game plays perfectly. From the creators of Mythos and Diablo 2 (no shit) comes this awesome 1-player action RPG. I will go out on a limb and say that Torchlight has more action than Diablo 2 ever did. It plays faster, smoother, and has a bit more depth. Not only do your characters have skill trees like in Diablo 2, but you also have the ability to purchase spells of incremental levels. For example, my Destroyer has a heal spell, the ability to summon zombies (for distraction), haste, and refraction (like thorns). But, you only have 4 spell slots, so this adds a bit more depth to the way you build your characters. In addition, you have a pet from level 1, similar to a merc in Diablo 2, but it really doesn't have the same abilities (that I've found yet...) as the merc did. In Torchlight, you find random fishing holes, catch some fish, and feed it to your pet a la a Boy and His Blob to transform your pet into different types of monsters. They can range from melee spiders to range attack fire elementals. You have the same core gameplay that Diablo 2 had plus these additional few things. It is so much like Diablo 2, in fact, that as you play it, you'll recognize some of the areas, from Act 3 to Worldstone Chamber. This video definitely looks like Act 5 of Diablo 2:
