The ‘good’ thing about the US Democratic party from a British perspective is that in theory it’s a broad front party, with liberals and social democrats and centrists and general progressives under one roof, rather than having half-dozen or more non-conservative parties splitting votes.
Of course, in practice the most right-wing element of that broad party is always in charge, with anything weakly progressive seemingly neutralised. (Yes, I also accept that the US Democrats are still more progressive on issues like immigration and LGBTQ rights than the UK Labour Party currently is.)