I don't think I've ever been so in love with a video game before...
It's buggy, horribly optimized, and suffers from such bad models and animations that they make a joke of it (traveling through landscapes that showcase herds of sheep-facades propped up in the pastures, or riding upon noble steeds who seem to be from the finest wooden toy horse stock), and you won't give a damn about any of it. The multiplayer is nearly impossible to set up and laggy almost to the point of unplayability once you do, but it's such vibrant, stupid and chaotic fun that you'll ignore such minor negatives in favor of the grander scheme of bumbling wizards.
The innovative magic system is profoundly complex and joyously destructive to experiment with, and there's a very scientific glee involved with working out your trademark spell(s) or finding the coolest combinations to solve a particular problem.
You'll also learn to develop a newfound respect for such veterans of the wizardry craft as Gandalf or Dumbledore... When you recognize just how much obscenely destructive force you have at your unwitting fingertips, it's always impressive when you DON'T manage to disintegrate/melt yourself and everyone in a 4-mile radius when attempting to do something.
While the game is fun enough on its own and the writing is of absolutely stellar class, with actually funny wit and some really quite unexpectedly subtle jokes and twists, this game excels at multiplayer. Yes, the horribly-irritating-to-get-started multiplayer.
My deepest recommendation is to play this game with 3 friends, preferably with none of you knowing your wizard staves from your rump bristles. Idiocy and a vast array of destructive weaponry often lead to the best of times, and ignorance of your own strength is the perfect excuse for "accidentally" slaughtering everyone on your team.
The game starts you off with a resurrection spell, and as with all spells and magic in this game there is neither a mana cost nor a cooldown of any sort... And you'll be very happy that it is this way, as roughly 98% of player deaths are either self-induced or from friendly fire. Or some wonderfully flashy combination of the two.
Indeed, the greatest danger you face is not the foe in front of you, but rather your overeagerness to simultaneously shock, burn, freeze and meltingly explode the ♥♥♥♥♥♥♥ into his primary colors. Positively philsophical, really.
I have never for a moment regretted purchasing this game. Indeed, my saddest moment was when it finally ended... for the second or third time. Along with all the DLC missions.