Actually if you look at where they started and where they got, they did a pretty good job in raising the very poorest our of poverty, electrifying the country, and really eliminating a lot of the abject poverty that was most of the country at the time of the revolution. Changes that the former (imperial) regime seemed uninterested in making.
Even into the 1950s and even 1960s quite a lot of people, including a surprisingly large amount of US government officials, thought that there was a chance the USSR could surpass the USA. I think such people were delusional, since the signs were pretty clear at the time (I was a child at that time, but I did study the USSR in the 1980s when it was very obviously not a threat to the west).
Don't get me wrong: the USSR was founded by a bunch of bloodthirsty assholes (Lenin, Stalin, Trotsky et al) and, for various reasons developed into a, yes, evil system. I don't blame it entirely on the people involved -- I think anyone who tries to follow that model, even with good intensions (and it's not clear the Bolsheviks had good intentions) is going to end up with a shitty result.
But dispassionately one thing they did accomplish was the thing you said they failed miserably at. And it's unlikely the Menshevik republicans would have pulled that off.