I use a Block Plane less than almost any of the other dimensioning and smoothing planes. Except when a low angle is needed, I will usually pick up the #3 or one of the wood stock planes for typical Block Plane uses. BTW, I will stumble around and get to the point.
A couple of years ago the local wood store had a sale on a knuckle cap low angle Block Plane, I really didn't have a need because I already had an under utilized Stanley LA Block Plane but what the hey....lack of need has never stopped me before. Anyway, it, the LA knuckle cap, Block Plane followed me home. Once home I did a cursory sharpening and gave it a try.....It didn't work worth a crap. I was busy with other things and like I said earlier I had other options for an operation I didn't do often so the new Block Plane got pushed to the back of the shelf and forgotten. In fact later I picked up a Veritas slew LA Block Plane that became my go to Block Plane.
Yesterday I was getting the final coats of paint on the pantry doors from hell and while waiting for the paint to dry doing tool maintenance. For some reason I noticed the unused knuckle cap Block Plane. I pulled the iron did a good sharpening, put it back together, and it still didn't work worth a crap. It took a heavy cut on one side and no cut on the other. I inspected the bed, checked the iron for square, re-sharpened the iron to make sure, put it back together and still no joy. I slewed the iron as much as possible where you could barely see the iron on the side that cut and the other side was a good mm or almost two extended with the same results. No shaving on the side with the extended blade.
Thinking I might be loosing it I packed it up and went to the wood store. We all stood around scratching our respective butts till one of the younger guys that could still see inspected the bed and could see that it was not level.
We traded bodies, I keep my iron, once home I tried the "new" Block Plane. It is really sweet and may become a primary go to user.