I think it looks great after the modernisation, esp. from the angle you've posted.Those are very manipulative pictures and perspectives. This is how the Reichstag looks from the ground:
The glass dome is very popular and uncontroversial. It is meant to give an image of modernity and transparency to the parliament. Visitors can walk inside the dome during Bundestag debates.
Unlike the Dresden Frauenkirche, rebuild enterily into it's pre-WW2 appearance, the Reichstag was supposed to look different from the time that it housed the german parliament until 1933. It was a political statement.
The layout and symmetry of this building (English Wikipedia claims it's Neo-Baroque, but it should be Neo-Renaissance IMO) actually reminds me very much of the recently reopened National Museum in Prague (Neo-Renaissance), whose façade continues to feature bullet holes from the 1968 Soviet invasion for the sake of historical accuracy.