^ yes, it is very different in that sense, and I agree with some of those complaints. The lack of tanks and healers...I'm still not sure how I feel about that.
I like that most if not all classes add useful value to dungeon groups and at the very least, dungeon runs are not simple zerg rushes like the open PvE world is...when the population is up. But what it boils down to is that the most useful classes tend to be heavies or AoE/DPS classes so that runs simply go faster. Some bosses require strategy, but it boils down to individual survivability. That is very "meh" for most people, and I get that.
But I also like that groups for events aren't locked into certain structures, like group find in SWToR: oh, no tank or healer available? sorry you 1,000 DPS builds, guess you aren't going to do that HM tonight. In the end, I'd rather be playing than sitting around and waiting for the one necessary class to show up.