By most measures, Diablo III has been a huge success for Blizzard Entertainment. Successfully coming out of the gate would be enough for most companies, but Blizzard games tend to have a lengthy shelf life. Two months after the release of Diablo III, the company has issued a letter to fans about the last 60 days and what's next.

Penned by Blizzard CEO Mike Morhaime, the letter touches upon a number of hotly debated topics related to Diablo III. I’d encourage you to read the letter in full, but I’ve pulled out the highlights:

On the severe server issues the game experienced when it launched:

“We’ve never gone from 0 to more than 6 million players across multiple continents within a few days with a brand-new game. For Diablo III, we looked at historical sales for Blizzard games and other top-selling PC games and watched preorder numbers. We even upped our estimates to ensure we had additional capacity, or so we thought. In the end, it just wasn’t enough, and that is something we will work hard to conquer for future releases.

In response to the immediate and overwhelming demand for the game, the team worked around the clock to support all regions, increase capacity, ship additional hardware to our datacenters, and troubleshoot and fix bugs as they sprang up. While things have by and large been running smoothly for several weeks now, various game-related issues have come up that we have either already responded to or are continuing to investigate (such as the latency issue some of you are experiencing) and make adjustments for.”

On what’s coming in the next series of incremental patches:

“You’ve seen some of that work already in patch 1.0.3, and you’ll see additional improvements with patch 1.0.4. On the game balance front, this update will contain changes designed to further deliver on the team’s goal of promoting “build diversity,” with buffs to many rarely used, underpowered class abilities. Another topic we’ve seen actively discussed is the fact that better, more distinct Legendary items are needed. We agree. Patch 1.0.4 will also include new and improved Legendary items that are more interesting, more powerful, and more epic in ways you probably won’t be expecting.

We’re also working on a number of interface updates, including social improvements that will allow players to more easily view their friends’ achievements, more quickly join games, and more efficiently communicate with each other. In addition, we’ll be making updates to the auction house in the future to provide players with better information through tooltips and notices, offer improved search functionality, and more.”

On the theory that Diablo III’s always-on requirement was more about DRM than anything else:

“While we’ve never said that this requirement guarantees that there will be no cheating or game cracks, it does help us battle those problems (we have not found any fully functional cracks). More important to us is that the online requirement is critical for the long-term integrity of the game experience. I fully understand the desire to play Diablo III offline; however, Diablo III was designed from the beginning to be an online game that can be enjoyed with friends, and the always-online requirement is the best way for us to support that design. The effectiveness of the online elements -- including the friends list and cross-game communication; co-op matchmaking; persistent characters that you can use by yourself, with others, and in PvP; and some of our customer support, service, and security components -- is tied directly to the online nature of the game. These and other online-enabled features are essential to our design for Diablo III. That said, there are still improvements we believe we can make to expand the online experience and make co-op play even more rewarding, and this will remain one of our priorities moving forward. Overall, while there are some downsides to the online-only approach, I still believe this was the best long-term decision for the game.”

Finally, on the subject of creating a more satisfying endgame for the most hardcore of players:

“We’re also working on a gameplay system that will provide players who have max-level, high-powered characters new goals to strive for as an alternative to the “item hunt.” We’re not ready to get into specifics just yet, but I can say that we’re actively taking your feedback into account as we plan out the future of the game.”