12 dreadnought list

So I was messing around with a list builder and for a laugh was just spamming dreadnought. Turns out you can have 12 dreadnought with 65pts left for a character/warlord.

I have the strange temptation to message around and borrow some from my local group... 3 melee, 3 short range/flames, 3 medium range 3long range. Character sits at home objective.

I just have the feeling any opponent would be flabbergasted by seeing a character and 12 dreadnoughts, no matter how bad it actually performs.

Has anyone run something like this and how bad(or good?) Was it?