Wow! By this definition everything an elected government does is in 'the best interests of the people'.
Do you apply the same logic to what the US and UK government do? Are you saying that noone can ever criticise anything an elected government does, because the government automatically "knows better"?
FWIW, while there have been some good social programs paid for out of an oil price boom, a vast amount of money has been pissed away, a lot of it for the sake of Chavez's personal political grandstanding and politiking around South America. Crime has increased massively, infrastructure and housing are still in a woeful condition, politics has become more authoritarian and centralised, trades unions have been suppressed, along with the media, the judicary and over levels of government. Now that the oil price boom and good years are over it sems hat a lot of money has disappeared.
I can see how the Cuban-doctors-or-oil deal was useful for normal Venezuelans, but why exactly do they need a bunch of overpaid consultants? The deal was just one of Chavez's political gimmicks. As for his popularity - it will be interesting to see how popular he is without a vast oil slush-fund, if there were better political alternatives to choose from, if he was unable to use nationalised industry, media and armed forces as a party-political platforms.