@Untrustedlife: The fortress mode is currently fairly unplayable as well, with the FPS dropping like a rock due to the visitor invasions (which is among of the fixed bugs, but those haven't been released yet). Thus, claiming adventure mode is completely ignored and and left in an unplayable state when fortress mode isn't playable either is rather unfair. As usual the major release has broken a fair number of things, and, as mentioned by others, circumstances have caused Toady to be slower than usual in getting the train back onto the tracks, and the bugs fixed so far seems to be a fairly good set.
I believe there are more fortress mode players than adventure mode ones, and if that's true, focusing on getting fortress mode playable first and then get adventure mode playable makes sense (I'm also biased as I'm a fortress mode player only, but I think the logic is sound regardless). I'd also focus on getting one mode up to a playable state first before turning to the other one, because that would get some of the users something, rather than splitting 50/50 and have neither mode playable until both are playable. However, "playable" is defined differently for different players, so Toady is always going to shift the focus too early away from "my" mode and staying too long working on issues for the other one.
I can also defend a decision to take care of a number of easy to fix but not critical bugs for the mode in focus before shifting the attention to the other mode, although I could also defend a decision to shift as quickly as possible.
It looks like the next release will give me what I need to start my fortress, and thus I'm (grudgingly) willing to hand over the focus to adventure mode to get that into some sort of preliminary shape (but don't stay too long!) with the next release.
After that, Toady will hopefully have some breathing room to fix important, but not critical bugs for both modes.