You are right. In the end your abandonment is your personal choice and it does not affect the reliability of the book. However, your choice of its abandonment affects your reliability in regards to academic material. For, if you are willing to abandon the like of Adab al Mufrad, Mushkaat, Targheeb wa Tarheeb... soon you will also abandon Nasa'ii or Ibn Maja.
Instead, say that since you are not academically equipped to scrutinize hadith you choose not to delve into it yourself. Which is fine, but to use words like abandon, unreliable, dismiss etc. This is not within your scope as well, for you are not equipped to do that either. So when you actually do it, you only weaken your own reliability. This is to say, when you stand yourself in opposition of those great scholars who compiled or endorsed these hadith works [knowing well of whats in them]; then in this picture if your stature cannot absorb the heavy weight of their critique, you only stand to loose your own credibility.