[Disco King]

That sounds more like an endorsement of MMP in particular than parliamentary systems more broadly.

I live in a parliamentary system, but it's first-past-the-post. As such, much like the United States, we've mostly devolved into a two-party system (we have more parties in parliament and have been called a "two-party plus" system because a third party manages to get a significant share of seats, though has never formed government) where we have a barely meaningful choice between a centrist party and a centre-right party. The reality of vote-splitting means that people who identify more closely with one of the more leftist parties will often have to vote for the centrist candidate in their riding in order to best prevent the right-wing candidate from winning.

The fact that we vote for local representatives, and that the party with the most representatives in parliament typically forms government with their leader as prime minister, does nothing to lessen the power or the prime minister in relation to the members of parliaments'. There is a strong party whip, and individual MPs almost always have to vote with the party instead of in the interests of their ridings (whereas an American congressperson can almost act like an independent, being free to break away from the party line and vote in the conscience of whatever corporation that's assumed the role of his Jiminy Cricket). In fact, the synonymity of the party leader with their respective party leads most people to say things like "I voted for Justin Trudeau," even if they live nowhere near his riding and his name was not amongst the options on their ballots. A Canadian Prime Minister actually has more power in Canadian politics than an American President has in the United States, as in a parliamentary system, there is no division of powers, and the Prime Minister leads both the executive and legislative branches.

This isn't me saying that a parliamentary system is any worse than a presidential system. Both systems work differently, but neither is inherently superior to the other. Whichever one a country has, it can conduct it in various degrees of democratic sensibility. The problems with the American system don't really stem from the fact that it's presidential rather than parliamentary, but rather because of the role of money in politics, the existence of the electoral college, systematic disenfranchisement of disadvantaged groups, and a historical legacy of racism serving as the bedrock for reactionary politics today.