The ak47 is ugly, but very functional, the exact point made above.
Tetris is a concept, not an implementation, it can be made to look good or to look ugly, but that doesn't matter. Yes the Russians invented a bunch of stuff, that's not under discussion - the point was that socialism didn't put much of an emphasis on producing stuff that had an esthetically pleasing effect on people, to put it mildly.
(to add to the examples I gave in another post - the Trabant. Come on, that thing is (compared to its contemporaries in the West) fugly.
The Soviet aesthetic can sometimes look retro-cool but you have to admit it's not much of a hit with Western consumers.