Well that's kind of disappointing.
Hopefully they get a bit more creative with future dungeons. Stuff with multiple paths, drop-downs, traps, puzzles, etc... Although, given that there's a time-limit, it could be that these particular dungeons are meant more for "get through and get it over with" type of content.
Maybe (hopefully) they have ideas for different types of dungeons in mind and others will be more elaborate and varied.
(this is me being hopeful and optimistic :-p)
