Reason integrated with Faith --Athens and Jerusalem was a great achievement of the Middle Ages.

So you can see how faith without philosophy leads to absurd results. But philosophy without faith also tends to lunacy.

So the question is how to get the right balance. I think that Kant, Kelley Ross [based on the Jacob Fries and Leonard Nelson] and Hegel are the best when it comes to philosophy.

That is to say: people that came before Kant all seem to have some sort of difficulties with either pure reason or empirical evidence.  Spinoza and Leibniz were great, so were John Locke and Hume. But each system has problems. To me it seems the best solutions are in Kant, Leonard Nelson and Hegel.

But philosophy after these three took a nose dive. To show this I recommend Robert Hanna's books showing how Analytic Philosophy misunderstood Kant and went off into directions not very well thought out. As for Continental philosophy the same goes. As John Searle puts it : "Twentieth century philosophy is clearly false". 

The point of philosophy is to see the big picture. What is it all about? But the idea that Natural Science needs philosophy is not so absurd as it sounds. After all there are tons of pseudo sciences nowadays tha masquerade as legitimate science. E.g. Psychology.  It is by definition pseudo science since there is no conceivable observation that could falsify it. Climate science is another doozy.