Tigole the lead designer in WoW has said "Karazhan has been a big success and I think a lot of players really dig the 10 man raiding size."
Will Zul'Aman continue with that success?
I say yes. Players like having that alternative to 25-man raiding. Aside from heroics, Karazhan and Zul'Aman are the only games in town.
It's also on a 3-day reset which will allow for more swapping in and out of people.
And so far, from what I've seen the trash is minimal. They seem to reward you for your efficiency of getting through trash.
But I think its going to be a bit bumpy. For one there is no attunement. While people cry about attunements, they forget what attunements are. They are a way of preparing you for what lies ahead. Some groups, like hardcore guilds don't really need attunements and they look at it as a speed bump to their progression. But on the other end, you have players who think if you can get
inside an instance you should be able to do the instance - regardless of gear, preparation or organization.
With Karazhan you had to run a few instances to get keyed, by getting keyed you at least got some gear and practice with a few encounters that weren't just tank and spank. But with ZA you don't need any kind of key. I wonder how many fresh 70s will try to find a group for ZA, simply because they can, when it has already been said that ZA is Prince/Nightbane starting difficulty (meaning it gets harder from there).
I think tackling ZA in less than average gear is going to be met with some surprise. I hear that people are going in with blues - I'm interested to know how far they are getting.
In the chat channel, people were looking for more to pug ZA. Perhaps my view of pugs are a little bit low. But I wouldn't pug ZA with a 10-foot amani hex stick.
Our group first night in, one of the many groups our guild fostered, was decently geared for ZA (Kara and T4 mostly) and we made it through a few bosses. We kept ourselves to only spending a few hours there. So I look forward to experiencing the rest in the future.
As long as you don't go in expecting to fly through it and take it for what I think it is, I think players will like it. If you clear it under the timer the first night out, this content is not for you. Unless farming for badges counts for content.
It's a new area for those either done or pretty much done with Karazhan, yet perhaps not willing (due to scheduling) or able (due to guild size) to tackle all of 25-man SSC/TK.
The gear in ZA and from heroic badges (which drop from Kara and ZA now in addition to heroics) may also get you better geared up for SSC/TK battles if you're so inclined.
Remember I've only been through some of it, so this is speculation. My guess is it's a good fit.
Oh, don't forget to pick up the quest to get a 20-slot bag.