Wittgenstein's later philosophical works, like Philosophical Investigations, attacked the bedrock of a lot of philosophy, in particular the kind that developed from Descartes (and arguably, if you want to trace it all the way back, to certain parts of Plato). His arguments have been quite influential, and frequently devastating broadsides against a lot of philosophy. The idea that philosophy has long been extremely consistent rather betrays the fact that you haven't read Wittgenstein, who was often entirely oriented around pointing out the faults in philosophical arguments, not just in a minor way, but by saying and showing how an entire philosophical debate often came down to conceptual confusion and mis-use.
