Fast compile times are cool, but I've never heard anyone say they liked programming in a language that Wirth created. The possible exception is Delphi as a Pascal derivative, but that has very little to do with wanting to program in Pascal.
Pretty much every 20 year old codebase is a mix of terrible stuff. The exceptions are rare and usually involve a strong handed dictator who is willing to make cleanups from time to time.
You're lucky it isn't Fortran and a homegrown (crappy) macro language.... You can't fairly judge Scheme or C from a legacy codebase unless you judge every other language that way too.