You're right, it is my problem. And?

But as to the rest of it, see below...
This is where we disagree: I have every right to demand improvements. If I buy a car with a 10-year warranty, or a lifetime one, I have the right to expect the company to deliver upon that promise. I paid for this game. The fact that it's "old" or that the online service is "free" does not change this in any respect. We are all (well, most of us) customers of Blizzard. If Diablo2 came out today, yes, they'd charge us for the servers just like they do with WoW -- but at the time, a decision was made that B.net would be free. That doesn't mean "free and neglected after it's no longer profitable".
You are absolutely right about the original developer team and the fact that no one left probably understands a damn thing about the game... that's part of my problem. There's a lot more going on here though than simple economics, and I'll explain...
Peter Jackson once said, on the LOTR extended DVDs, that he "hated magic". And he really emphasized the word
hate. He went on a rant about how he can't stand wizards who fight with fireballs, etc etc, and wanted Gandalf to be practical, etc etc. This is extremely important to understand, because this attitude is shared by
an overwhelming number of what marketers refer to as "gentle medievalists".
To show you where I'm going, it is believed that the core of World of Warcraft players are members of that demographic.
So, look at it this way. It's 2002, and Diablo 2 is still going strong. It's still technically your #2 franchise behind Warcraft (but ahead of Starcraft at the time). World of Warcraft is in the first stages of development. And then you get a marketing report which basically states that the people who play Warcraft... the educated, gentler types who make a higher income and are more willing to spend $$$ a month on gameplay... are very uncomfortable and intolerant around the demographics of Diablo 2. The demons. The immaturity of those players who duel. The "unwielded" imaginations of those who love fantasy but don't need much realism with it. The idea that a bit of a Holy War might break out over it.
Yes, that marketing report does exist; I've read it. I don't work for Blizzard so I can't tell you whether this factored into their decisions; all I know is that part of the D2 team left and made Guild Wars... and the rest left soon after and began work on Hellgate. I'd have left too if my company was going to bust my franchise down.
Anyway, as you can see, I have a bit of personal zeal invested in this and I'm just pissed about it. I don't like being part of a minority. I don't like the fact that some Hobbit-loving (expletive deleted)ers are getting the royal treatment simply because some marketers determined that they were better customers than you and me. And I detest the fact that D2's "brand of fantasy" is looked down upon, and that this has now extended into the neglect of the game I love.
And you're right, there's nothing I can do about it except to *****. But I am who I am and I love what I love and I like being angry about this, because one day, maybe I'll get angry enough to do something about it.