It really depends on the brownies. Nuts can take a really good moist brownie to the next level of perfection. Or they can make a dry crappy brownie that much harder to eat.
The best brownie I ever had had cashews in it. But it would also have been the best I'd ever had without them.
"ATTENTION: Customers browsing porn must hold magazines with both hands at all times!"
The best brownie I ever had didn't have any nuts in it.
Diogenes of Sinope: "It is not that I am mad, it is only that my head is different from yours."
Arnold Judas Rimmer, BSC, SSC: "Better dead than smeg."