On what grounds do you object to austrian methodology?

I ask this because a lot of complaints about AE are focused not on AE but rather are disorganized attacks on various conclusions made by AE. This is very common in situations where the person attacking the idea has very little understanding of where the idea is coming from.

So, what about Austrian methodology is wrong? Is knowledge gained from logical deduction from initial observation invalid? Is the concept of action fundamentally mistaken? Does praxeology presuppose a fact which is false? Or do you have a different objection?

(this is not a discussion of whether or not common AE positions are wrong. If you want to debate that, go to any other post on this subreddit. This is specifically about methodology.)