After installing the expansion "Wrath of the Lich King" and playing it for about 2 1/2 weeks, I have found it to be the best expansion, if not the best gaming experience in the MMOG ever done. The questing in Northrend both Borean Tundra and the Jford has been very compelling: in terms of both gameplay and lore, I have spent many happy hours exploring and the new areas and doing the new quests. I did a Death Knight in the Beta, and found the starting quest line the best ever done in any MMOs. Right now I am focusing trying to get my Holy Priest to 80, but will go back and do a DK just to do its quest line again, it was that good.
I have now done several instances in the expansion, many of them with 4DKs (DKs can't heal), I have found them to be beautiful, and well planned. They tend to be shorter with almost all being able to be done within an hour (vice the 2 to 4 hours the preexpansion ones), and in general more doable and accessable (& that DKs are OPd). As a healer, however, I have found several specific bosses more challenging, and as a whole it seems that cloth wearers (Locks, Mages, Priests) are at a disadvantage (in terms of getting killed more than before the expac). The artwork in the expansion is simply a masterwork, not just for MMOs but for all visual arts, it really belongs in a museium. The music is wonderful, even memorable and is so closely integrated into the game, it gives it a cinematic effect drawing in the player emotionally. While not in the game notes, the graphics engine has be upgraded, even the "old world" looks better.
One new feature I have a complaint about is the new ingame group calender, it does not allow the raid leader to send out group invites, instead its one at a time, for something like 10, 24 or 40 man events, it is just too much of a pain, the Group Calender add on is still so much better.
I did take my own advice and order an encryption dongle from Blizzard shortly before the expansion came out, I was wrong about the price in my last post, it was only 6.50USD, and shipping was FREE. However, as events turned out it too Blizzard about two weeks to send it, and so on the 2nd day of the expac, while I was in the middle of buying and selling on the Auction house, I was suddenly DCd, and unable to log to back on my account. I immediately changed my password, got back online and found I had been hacked and 2 of my toons had been robbed of items and gold. I put an immediate ticket to the GM, but because of the new expac it took hours for Bliz to respond. It took about a week and I did get most of the items in my bank and packs back but little of the gold for one char. nothing for the other. According to Blizz, I was the subject of a Denial of Service Attack and sophisticated hack, they didn't say (and not likely to say) but it may have been an inside job, it may be that someone actually reads these reviews.
Before you say that was near impossible, I know the same thing happened to a veteran guildmate in Irontree, and not only did he have his toons robbed, but put 24K USD on his creditcard. (The current CC info I have with Blizz was outdated, since I just had gotten a new card). He did say that Blizz did dig into it and provided the CC company with the records showing what happened, they did not and would not provide it to him directly (my guess it to keep players from going after current or former Blizz employees-and then Blizz getting sued by its unhappy employees). Anyway, the security dongle came in a week after the expansion, and I have not had any trouble with my Blizz account since.
My additional experience tells me two things: 1) It confirms that account hacking is out of control in WoW, and 2) EVERY ONE WITH A WOW ACCOUNT SHOULD GET THE 6.50USD SECURITY DONGLE FROM THE BLIZZ WEBSITE.