The little that's backed up by evidence in there is Russia's public propaganda efforts, like Russia Today, which aren't really anything new (though certainly interesting).
What's controversial is the hacking and I haven't seen anything that attributes the hacks to Russia beyond reasonable doubt. If the evidence was taken to a US court and put before a judge and jury, I don't believe a prosecutor could get a conviction.
I understand that the US wouldn't want to give up its intelligence sources but I also don't think that the people of the US should let the government make foreign policy decisions based on hidden evidence. That's how Iraq happened.