They're literally the only thing that doesn't make me puke in dungeons. Are they interesting? No, not really, but at least they're not DDR slop while hitting a dummy. Wish we had actual engaging jobs to enjoy ourselves over that trash though.
To my perspective it's the bosses that are here to lengthen an instance. At least they quelled this down a little in 7.2, so instead of being infuriating, bosses are now as bland as trash.
How? I mean, there's: no priority focus to be made. No mechanics linked to these packs. They follow on from each other at a pace that sounds like my neighbour snoring. How does that stop you falling asleep in the dungeons?