Wages and medicine: actually more inequality than ever.
Life expectancy: scraping the barrel.
These aren't concrete things. If they were we could, like you say, measure them properly. But even in the best conditions your anlysis would be linking your values to your methods.
My point: measuring stuff like this in a 60 year old regime based on self perpetuation and social control is not improvement its indoctrination.
For example: are wages higher by mean, mode or median.
Or more simply does less crime measure the improvement of a country. I can think of several pertinent examples of regimes and dictators who were quite sucsesfull with crime.
Higher life expectancy.. Well that's quite an easy one to improve when you stop starving everyone.
I'm not saying all my points are 100% kosher. I'm saying improvement is a very subjective term reaking of contradiction when not simplified or taken out of context.