Marx spent the first half of the first chapter of the Communist Manifesto "worshipping capitalism" and praising capitalism for more extensive advances than ever before. Marx strenuously agreed with your "better than nearly all other systems" to the point where he argued capitalism was a necessity in order for socialism to even become possible, because of the immense economic growth brought by capitalism.

It's not Marxist to hate capitalism, it's Marxist to see capitalism as an incredible advance over what came before, which can still be improved on thanks to capitalism laying the foundation for further advances.