Recs.
Updated
Diablo III is a hack 'n slash RPG that focuses on loot collection and improving your character. It's set in a world overrun by demons called Sanctuary and only you can stop the demon threat.
SpecsUpdate
Pros
Pro Fun to collect loot
One of the better parts of Diablo III is collecting the piles of gold, the colorful gems, and various pieces of equipment. It's especially exciting when a legendary quality item drops from a monster since it makes a distinct sound effect and shoots a beam of orange/green light into the sky. So whenever a lot of legendary items drop all at once it just feels incredibly satisfying.
Pro Easier to learn and enjoy than most other similar titles
Diablo III is very simple, requiring very little to no planning to succeed. You create a character, pick a skill and just progress through the game while occasionally upgrading your equipment. You can change skills and any stat points you've earned without penalties. You can also choose from one of the 17 difficulty levels, so you can always play at a level that's challenging but not too stressful. All of this creates a game that you can enjoy without worrying about messing up in the long run.
Pro Decent selection of character builds to try out
There are more than 50 distinct class/skill combinations, including ranged builds, melee builds, support builds, defensive builds, pure-offense builds, and many more. You're sure to find a build that you'll enjoy playing, whether you prefer to play alone or with friends.
Pro More updates even after 5 years from release
They are still cranking out awesome updates. If you get bored after a longer period of playing and stop for a season, the game might get interesting again after some updates.
Cons
Con Endgame grinding can get really repetitive
The endgame in Diablo III consists of only two things – completing bounties and clearing greater rifts. Both of these have very little variation in them, so quite often you'll run through the same map layouts, clear the same enemies, and complete the same objectives. This gets extremely stale after long play sessions and can cause you not to pick up the game again.
Con Expansion costs as much as original game
Should be free (for a number of reasons).
Con Glacial Update Pace
Blizzard (the dev company behind the game) is kind of famous for taking a really long time to get each update just right. This is sort of both a pro and a con. It is a pro because they release quality content (most of the time), but it is also a con because there is always a long stretch of time between updates.
Con Less focused around growth than previous installments
Previous Diablo games were known for having permanent improvements throughout the game, where Diablo 3 focuses more on customization as you increase in levels rather than improving your abilities. There's a chance that you will unlock your favorite ability at level 5 (I'm looking at you, Rapid Fire) and never use anything else in the game, because you can. Many people consider this an issue with Diablo 3, and expected more of the "specialist" style of gameplay.
Con Just another game (wasn't trying to impress)
Blizzard wasn't as concerned with impressing the audience. It was just more of the same, really. There's more to it than just re-creating a game with similar dynamics. Its called a new story-line and without it you just aren't going to impress people.