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Dumbest units for 40k? Mind you, my primary years of 40k were 3rd/4th and most of 5th edition, so I have not much reference for dumb things since then.

For the necrons I think the flayed ones were the dumbest.
For space marines, the centurions
For tau, I always thought the kroot didn't fit in at all, even if the vespids started off weak they at least fit the theme well enough.
Imperial guard, the rough riders, I still think its cool for cavalry to run around with huge bomb tipped lances, but its still dumb, cool and dumb.
For eldar, wraithlords with swords
Grey knights, those knight/mech things.
Orks, the mega armor that came out in 3rd/4th was just so dumb to me, and those power claws. I know they're kinda iconic to orks now but I still don't like it.
Chaos space marines, I liked their old dreadnoughts and I think hellbrutes are a dumb substitute.