As a trade union official myself, I'd just like to say that that is some seriously good shit. It's practically a wishlist of all the things I feel would make my job of representing people in distress easier.
I know Unite are critical, but other unions are less so. I'd suggest that Unite's criticisms are more about the strength of the pledges (i.e. how committed Labour are to implementing this stuff quickly) rather than the content of what's being promised. While they could always go further, this is nonetheless a really solid set of reforms.
That'd be the same Green Party who oppose nuclear energy, whose local politicians oppose solar farms due to NIMBY issues, who opposed HS2...
They talk a good talk, and they've got the branding down, but their actual track record on genuine environmental policies is pretty blotchy.