Although Blizzards commitment to make Diablo 3 the best it can be, it is a bit disappointing to see that the PvP system is less than satisfactory, and thus meaning that no PvP system will be added to the game upon launch. Blizzard are leaving the PvP system out and are leaving it to a later patch, so this is good news for people who don’t like PvP. However, some will argue that PvP is part of MMORPG’s and a little pointless to have one without it.

Blizzard have said that “multiple Arena maps with themed locations and layouts, PvP-centric achievements, and a matchmaking system that will help you and your team get into fairly matched games quickly and easily” are the features that they are working on for the patch.

As we’re counting down the days until we’re ready to announce a release date for Diablo III, we’ve come to realize that the PvP game and systems aren’t yet living up to our standards. Today, we wanted to let you know that we’ve made the difficult decision to hold back the PvP Arena system and release it in a patch following the game’s launch. After a lot of consideration and discussion, we ultimately felt that delaying the whole game purely for PvP would just be punishing to everyone who’s waiting to enjoy the campaign and core solo/co-op content, all of which is just about complete.

Source: Battle.net