I played through Diablo II (including the expansion) all the way to the end at least four times; I made new characters and played them into the fourth or fifth chapter quite a bit more. Diablo II was a solo player game for me, and I never did its "hard modes" - I didn't take a character I had beaten Baal on and replay the content with that same character.
I did, however, enjoy running through the game with a new character, to try out a different class, or a different playstyle. (Charged bolt sorceress! Woo! Actually, the Amazon with charged-bolt-releasing gear was probably the most fun charged bolt experiment...)
I'm bringing this up for a couple reasons. Firstly, I've got a fairly serious stable of alts: 9 characters on my main server are level 80+. WoW is so much more of a time-sink than Diablo II was; getting characters to similar levels of investment and playability would require more time than my commutes 45-minutes both ways, works 50+ hours a week life allows. Secondly, WoW, to me, is the original Diablo III.
Right, right, Diablo III is still in development, and Azeroth is most certainly not the setting for Diablo II. They're entirely separate franchises.
At the same time, there's a lot overlap in the character classes and basic user interface design; paladins have auras and can heal or tank; barbarians and warriors both have a couple of different fighting styles and utilize various shouts (although I really miss the shout that got me potions... and dual wielding throwing knives, which was awesome); assassins and rogues both use a combo point/finisher style; amazon + druid = hunter + druid; necromancers and warlocks share a few traits; and of course sorceresses and mages.
WoW built on and expanded a lot of what I was already familiar with in Diablo II, which made switching to it as my graphical game of habit fairly easy. (I was replaying Diablo II up until I started WoW, and I've still gone back to it a couple times.)
What WoW didn't initially do was make it easy for me to "replay" it; this wasn't so much a matter of the content not being accessible from scratch, and hey, I could mail my alts money! No, the problem was the time sink. Leveling took time, traveling was slow, and the barriers to entry at higher levels were pretty steep.
For the most part, Blizzard has been really good at improving on WoW's replay value: between changes to the leveling experience and the introduction of heirlooms, a new character doesn't have to repeat content I didn't like, nor do I have to slog through every kill-and-collect quest I did five years ago on another character. Running dungeons lets me collect points for gear, so if I decide to go to alt raids on a character three tiers in, I have a reasonable route to gearing her up.
The biggest remaining time-sink in alt leveling? Reputation grinds. Oh, but there's tabards! Sure, and the tabards help. But I don't run dungeons on my alts nearly as much as I do on my main, and I can hit 85 in two or two and a half zones. Hyjal is nice and fast, and Deepholm is generally the follow-up, at least until I hit a level to go to Uldum or Twilight Highlands.
Skipping out of Deepholm, however, no matter how tired I may be of some of the quests there, locks me out of shoulder enchants on my alts. In Wrath they ameliorated this problem by making reputation based enchants bind-on-account; you could just mail them to alts. It remains to be seen if Blizzard will do so again this expansion. If they don't? I'm pretty sure my alts will never have anything better than the blue shoulder enchant... once I drag them all back into Deepholm to finish the zone and open up the Therazane vendors. I don't do dailies on my alts unless it's for profession tokens.
The Sons of Hodir were the barrier to entry for non-inscription shoulder enchants in Wrath, and you couldn't just waltz into Storm Peaks and start working for them. But maybe three hours of questing and I could unlock their dailies (including turning in boatloads of tokens for fast tracking exalted, prior to the BoA change). Therazane is buried so far in Deepholm (it's the last quest chain, no?) that it takes me much longer to get to and open. The time invested/reward ratio is steeper than my patience is willing to bear six years in.
Don't get me wrong - WoW's replay experience has gotten a zillion times better than it was originally, or (ugh) in Burning Crusade, when running heroics on my alts meant a rep grind again. (Most of them weren't too bad to get to honored, but the heroic dungeons in Auchindoun seemed terrible to unlock.) But tying profession recipes to reputations? *grumble*
For the longest time, Sporeggar was my rogue's (my third most played character's) only exalted reputation... because she was an herbalist and could farm the hibiscus. (Tiny sporebat, omg.) Yeah, yeah, flask recipes on reputation vendors... no, thanks. Don't have that kind of time.
Five and a three-halves toons into this expansion, I really don't have the patience for reputation grinds anymore.
