Yes, he does.
The most important doctrines are getting the Gospel right, God right, man's condition right.
Most have a problem in one of these areas either making them preach a truncated gospel, which makes it false, or they add to it their goodness as to why they were chosen or as to why they chose God, so the Gospel becomes false by addition or subtraction.
Then there is heresy about God, Christ of course included there, and the condition of man. All of these defects effect the purity of the Gospel.
There are other doctrines that aren't as high priority, but the basics above are necessary to be correct on.