Yea - more than a few of those are in my collection too.
Later cultures flint knapping was not as refined and exquisite as earlier.
One would think that as eons progressed, flint knapping skills would as well, but that is not what appears to have occurred.
Whereas earlier cultures relics had collateral and other flaking techniques with fine pressure flaking of the edges, later often employed random percussion flaking without much pressure flaking.
Then other the other end of the spectrum you could have a well made flaked tool which after the abuse and use, is just beat every which way to Sunday and looks very rough.