One thing I’d like to mention in regard to Diablo is that for me and my friends, the most addictive Diablo game so far was Diablo I, not Diablo II.
We played Diablo for several months, even though there was nothing to do but to play through the first few levels of Hell, up to that room with Lazarus and the two other special monsters and repeat, always hoping to find some nice items.
When Diablo II came, we where quite impressed by all the improvements and new features it had, and by the sheer size of it. We liked the game a lot when we played it, but nonetheless we stopped playing rather quickly. I did one playthrough on normal, played around with a few other classes a bit and that’s it. I think one of my friends played through most of Nightmare difficulty, maybe he even finished it, but none of us ever finished a Hell playthrough. I bought the expansion, but the first time I actually played through it was a few years ago when I re-discovered the game as a title for coop play with my girlfriend.
I’ve always wondered why Diablo II turned out to be so much less addictive, even though it seemed like a much better game. I believe it’s pretty much related to the “carrot”, or profit & loss in the thread’s terminology.
In Diablo, the carrot was right there, as real and tangible as can be, right in front of us. At the time we played it, each of us would have been able to list the items he was looking for from memory - even today, I still recall the godly full-plate mail of the whale and the King’s Sword of Haste. Each time we went into Hell to fight Lazarus, we knew we had a tiny chance to find one of those. When I was able to upgrade my sacred whatever mail of something to an awesome something, I could clearly see the step towards my desired perfect set of gear. None of us ever found even one of those perfect pieces, but that didn’t matter.
In Diablo II, there where so many different items and types of items that none of us really saw through them and figured out what his personal perfect set was. And none of us ever had a chance to find such an item, anyways, because we’d have had to play all the way to the end of Hell difficulty for that, and none of us ever did that. The carrot always remained vague, foggy and far, far away.
I am aware, of course, that a lot of Diablo II fans have actually played all the way through all difficulties with several characters, but I’ve never known one of them. I guess those people are a certain type of hardcore players who focus on just one game for a very long time. However, that’s not an approach that works for me.