I've argued with a few on this site about the idiocy of overconsuming protein...and their only response was "it wont hurt". Damn I wish I could remember who the dumbasses were just so they could finally open their eyes.
Overconsuming ANYTHING is not good for you. These are made as a supplimental protein source, that's it.
Most of your protein should come from real food. Don't think there's not all kinds of shit in there too. Heavy metals plus hormones, antibiotics, etc. And fruits and veggies have herbicides, pesticides, weed killers, etc.