Dragonborn as the
worst Bethesda DLC
ever?Those are some pretty strong words, friend.

I haven't gotten to the dragon riding yet, so I really can't say anything about it, but to be perfectly honest ... dragon riding isn't the reason I was looking forward to this DLC.
We have an entirely new map that offers some 50+ locations for us to explore. That's where your money is. I am absalutely loving the game, and this is coming from someone who has never even played Morrowind. I'm very happy with the open exploration of the island. I'm enjoying all the side quests, which are a lot more hearty and thought out than the Dawnguard sidequests were. I love that the DLC is as challenging as it is. I'm playing a level 50+ character, and was finding the vanilla game quite easy. For me, things like armor are completely superficial, and yet I till managed to smith and improve chitin armor to make my character a little more hardy against the new enemies.
Honestly, I believe this DLC is exactly what you make of it. If you were highly anticipating dragon riding and the possibility of warebears (which I think we all understood going into the DLC we would only encounter and not be able to become) ... then yes, I guess you will be dissapointed.
I was looking forward to being able to explore 30+ hours of new content. I'm probably halfway through the main quest and I'm taking my time, stopping every now and then to smell the roses (or rather, the ash-laden landscape).
As for some of the other issues you brought up:
Morang Tong: we already have the option of joining the DB (which are in direct conflict of the MT to begin with) and the Thieves Guild ... I see no reason why we should join another similar faction. I have no issue with running into a rival clan that is more prevelant among the Dunmer people and Morrowind. It makes perfect sense to me lore wise.
Apocrypha: is absolutely amazing. I see no reason as to why we should be able to access the whole of a daedric realm. We may be dragon born, but we are not gods. You were not able to access all of the Soul Carin either. It made sense that the Soul Carin was more open for exploration too, whereas Apocrypha is only accessible through a number of books that provide forbidden knowledge from HM. He's not about to give us all his secrets. The Lovecraftian imagery is absolutely breathtaking and I thought Bethesda did an excellent job with this Daedric realm.
Spears: I could care less about spears. People were spoiled that "spears" would appear in game because they read into the game files, but they had no idea how the spears would appear as a game mechanic. That's what happens when you are given so little information to start out with. People had nothing better to do than to speculate and I guess some people got their hopes up a little too quickly.
New Armors: I will grant you that the new armors are visually underwhelming for the most part. I kind of felt that way about the vanilla armors too. The only light armor I've ever truely liked was the Nightingdale Armor, and I set that aside for Chitin for the sake of trying something new and "role playing" in the new environment. With that said ... this is a very superficial issue for me and so I've been able to look past it.
You take the good with the bad, and at least as far as my gaming experience has gone with this DLC, there is far more good than bad. I'm sorry your experience couldn't be th same OP.