I'm split on my opinion on Spinoza. While rationalism has some decent tenets, I'm not a huge fan of determinism, even though I know it's probably right. He spent to much time blabbing on about the vaguely defined "substance". He was clearly ahead of his time, as the "one substance" could be a mention of strings, quarks, atoms, etc, while rationalism has become the groundwork for much of science and determinism is a probability because we're all biological machines, but for some reason I have issues with him for reasons I can't figure out.