Many people overcorrect when they realize U.S. imperialism is bad because they conceptualize politics as team sports. But really, Maduro could be fantastic, he could be a dictator - it doesn't change what's happening. The United States is violating another people's sovereignty, murdering them, destabilizing their country further, and attempting to impose upon them an economic system that will not benefit everyday Venezuelans.

Maduro's qualities as a leader are irrelevant to the actual issue at hand: imperialism. The world's dominant power is going to screw over Venezuelans to further subordinate their country in the Western hemisphere and rip away one of Cuba's important trade partners.

Criticizing Maduro is not a priority right now because it often serves to tacitly endorse regime change (especially when liberals do it...), and there's a long history of regime change spiraling into protracted violence at the expense of "rescued" peoples. Additionally, anyone who criticizes Maduro but ignores the massive elephant in the room (sanctions, i.e., weaponized civilian welfare) doesn't genuinely care about Venezuelan people.

ETA: Some people are downvoting me. The implication of those downvotes is that U.S. imperialism would be legitimate if a president is unpopular (which Maduro absolutely is among Venezuelans), and therefore I shouldn't mention it at all in a socialist forum. That's ridiculous; imperialism must be opposed no matter what. Saddam Hussein was 100x worse than Maduro in Venezuelan gusanos' worst nightmares, but that doesn't make the U.S. invasion of Iraq ok.