It's better than nothing I guess. But the dems have been pretty useless as an opposition so far and it's depressing that tweets from newsome are currently the best on offer.
Although the US does have an inherent problem in its system (amongst many problems) in that there isn't a leader of the opposition in the same way as in parliamentary democracies. Political opposition and attention tends to coalesce around such people in places like the UK or Canada.
Trump managed to be defacto Republican leader while out of the white house, managing to get attention and interest despite in his base having no official role. The dems don't have a figurehead to unite them. Particularly as the party refuse to coalesce around popular voices like Bernie Sanders and others on the left who do seems.to be cutting through.