They're not bad, but I wouldn't be happy with most of those.
Person #1 is slightly losing back angle off the ground, leaving too much hip extension in the second half, followed by an exaggerated and unnecessary shrug and shoulder roll.
Person #2's stance is a little too narrow, and again she isn't getting the most out of her quads in the first half of the lift.
Person #4's arms are too vertical in her setup.
Same for person #5, and she's moving around too much in the lockout position at the top.
Person #6 is lifting with her cervical spine in overextension.
Person #7's stance is a little too wide, his arms are too vertical in the setup.
Person #8 is pulling with the bar away from his shins.
And it looks like most of them don't know how to lower the bar. In addition to the fact that you can't make many conclusions from videos of crossfitters deadlifting 75 lbs.