Currently I'm reading the memoirs of General Heinz Guderian, titled Panzer Leader. In it he states that he refused to give out the commissar order to his troops when he received it in 1941. Also it is noted the numerous fights between himself and Adolf Hitler. The book, however, does not delve deep into his political views (as I would expect in a book about his military career). Was he a strong follower of Nazi beliefs? Was he a anti-Semite?
Your overall question is difficult to answer but it is worth noting that by the time this book was written (and many like it) the people writing the books had a huge incentive to "diss" hitler and also he was unable to respond.
After the failure of the general's plot Guderian became the chief of the general staff and he took part in the succeeding purges in the army.
The wording of his orders from that era are clearly those of a "strong follower of Nazi beliefs". In fact he ordered the general staff officers explicitly to become exactly that:
"there is no future for the Reich without nazi socialism. Therefore you must put yourself onto the vanguard of the national socialist Reich."
He wrote his memories while working as a writer and advisor for Amt Blank, the predecessor to the West German ministry of defense which at that time had the stated aim to exculpate the Wehrmacht.
In 1950 he was involved with Karl Kaufmann in the Bruderschaft group. The latter was arrested briefly by the British 1953 and the group was dissolved. It was an "altnazi" society, as they put it in German - i.e. post-war neo-nazis but ran by the folks who were involved in the real thing.
source: Das Personenlexikon zum Dritten Reich. Wer war was vor und nach 1945 by Ernst Klee.
Anti-Semitism was incredibly prevalent back then, so it's not as if Guderian would have stood out then. In fact, Churchill was a huge believer of the Jewish conspiracy. There is a story that Guderian taught his dog to give the "sieg heil" salute as a joke, but only when close friends were around.