The name Great Britain refers to the landmass containing Scotland, England and Wales. It has nothing to do with how good it is...
As to the Germans, whilst you'll find a lot of stuff telling you how awful the DDR was (and quite rightly so) and the horrors of the Nazi era can't really be denied I would say that they don't really do a lot of introspection or commemoration. The laws in their constitution and the Nurenberg trials forced them to look in the mirror but afterwards there was kind of a code of silence around what Opie did in the 30s and 40s. Their treatment of their Turkish community was awful for a long time, also.
This isn't to say "Britain good, Germany bad" Every country struggles to give a balanced account of itself and to accept that both the good and the bad make up who they are. To expand on my earlier bit about Leopold, Belgians like to point out that he kept all the money from the world's largest plantation that he ran to himself and thus, their hands are clean.
The reality is that he was employing Belgians to enforce his terror in the Congo and that he spent the money on building monuments to his glory all over Brussels which he then donated to the state on his death and that plenty of them paid to view the human zoos that travelled the country. The museum of the Belgian Congo was, until its closure for a total remodeling 5 years ago, well, erm, interesting.