Party chairs should normally be judged on two things: raising money and winning elections. Then in the case of Democrats in 2018 registering voters and fighting voter suppression since that is clearly a major part of the Republicans 2018/2020 campaign strategy.
So far Perez is losing in the donation war. The Republican National Committee raised $132.5 million in 2017 and ended the year with almost $39 million on hand and no debt. The Democratic committee took in $66 million and had $6.5 million in cash available, but also owed $6.1 million. That is unacceptable cause the Dems have the wind to their backs. fundraising should not be something they are struggling with that much.
I am also not a fan of them paying Hillary 2 Million to use her rolls of donors to build support. The DNC should build their own rolls, and stop tying themselves (again) to the Clinton campaign folks. They were too close to them in 2016 and look what that led too. Keep all the Clintons at arms reach, they basically pimped out the DNC leading into 2016 and basically ruined the organization's reputation after the loss.
Perez should pull off wins of seats in the Fall through the motivation for that will likely be the hate people have for Trump and Republicans. They have spent a significant amount of time trying to suppress internal politics and progressives which is short-sighted. There is definitely this undercurrent of the Dem leadership acting scared of a liberal freedom caucus coming into power. A strong DNC could help mitigate that by creating opportunities for candidates from both wins to support each other. However the current DNC is not strong, so they flip-flop on if the party should take money from Fossil Fuel companies. Anyhow, while I hope to give Perez credit for wins in the Fall it will be because the Dems basically succeeded in spite of his lack of ability as DNC leader......
Also, I am not even sure the DNC admits they need to campaign against voter suppression. That shows another lack of foresight on their part. Its clear Republicans are trying to win by removing (mostly minority) people from the voter rolls without their knowledge. Where is the DNC pushback on that? The campaigns to make sure people know to check to see if they are registered? There are none cause Perez sucks at his job.
Too summarize I am not a fan of Perez, it should have been Ellison who had the support, but Obama (who has never had a good grasp of what the DNC does, and at one point tried to undercut it) got involved and here we are..... too many compromises and Perez who doesn't seem to grasp the enormity of what the DNC should be doing right now in charge. Whereas Ellison went from Congress to his states AG because he had the foresight to see that position would be a better for him because the DNC is now a joke. The DNC had the potential to be a key organization leading to the 2018/2020 election seasons...... but its ineffective.